233621 Zen User manual

Noise Cancellation Mode and

Ambient Modes

Cycle through Noise

Cancellation Mode ON,

Ambient Mode ON and

ALL OFF

Noise Cancellation Mode: Our noise canceling technology

and optimized passive isolation can suppress wide-band

ambient noise

Ambient Mode: Allows you to hear sounds around you

even while wearing the earbuds

Press thrice X3

QUICK

START

GUIDE

ZEN

Charging cable

USB-C to USB-A

Ear tips

Touch pad

Earbuds LED indicator

Charging case LED indicator

USB-C Connector

Earphone

Charging Case

Packing List

Product Illustration

User Guide

Choose your ear tips

Use the touch pad

Turn On/Turn Off

Pairing

Ear tips (S/M/L X2)

Do not plug the earbuds into your ears without installing ear

tips, as this may damage your ears

Use touch pad to control Music volume / Play / Pause,

Pick/Hang up /Reject call, Noise Cancellation on / off,

Ambient on / off, and activate the Mobile phone's System

voice assistant for conversation

Turn On: Take out two earbuds or any one earbud from

the charging box.

Turn Off: Put the earbuds back into the charging box.

*To avoid hurting your ears, please do not apply excessive

pressure on the touch pad with your ﬁngers (touch pad lightly)

*To avoid damaging the touch pad, please do not click on it

with any sharp objects

*If the mobile device is not connected in 5 minutes, the earbuds

will enter standby mode, you can follow step 2 to re-pair.

* The earbuds are set to Noise Cancellation Mode when powered ON

After putting the earbuds back into the charging case

and then taking out, the earbuds will automatically

connect to a recently connected mobile phone.

1. Pair and connect for the first time

Wear demonstration

After putting the earbuds into the ear, rotate and adjust

the earbud to the right depth and angle to ﬁt the ear

canal (as shown below)

The size M ear tips are attached to the earbuds in-box.

2. Bluetooth remote disconnection and reconnect

3. Turn on to reconnect

①Remove both earbuds from the charging case;

②Put both earbuds into Bluetooth pairing mode;

③Press and hold the touch pad until the LEDs on the

earbuds flash red 3 times;

④Return the earbuds to the charging case and leave

them there for 10 seconds;

⑤The pairing record is now cleared.

* After clearing the pairing record of the earbuds, the

earbuds will enter the pairing mode directly.

4. To clear the pairing record of the earbuds

①Take out the earbuds from the charging case;

②The LEDs on the earbuds flash red and white alternately,

and the earbuds enter pairing mode;

x3 > 00:02

④After a few seconds, a Bluetooth pairing request pop-up

window will appear, press “Pair” to connect the

second earbud;

⑤Enjoy your Zen

③ Find "233621® Zen" on the Bluetooth list to pair the

ﬁrst earbud;

Bluetooth

233621® Zen

Bluetooth

233621® Zen pair

①If the earbuds are disconnected with the mobile

phone and return to the effective connection range

within 10 minutes, Bluetooth will automatically reconnect.

②If the earbuds are disconnected with the mobile

phone and return to the effective range after 10

minutes, Bluetooth needs to be reconnected manually.

Rotate and adjust to 45° angle position

* For the earbuds that are not paired for the ﬁrst time, when

connecting a new mobile phone, you need to touch the pad for any

earbud 3 times in a row, and the third press holding for 2 seconds,

the LEDs flash red and white alternately.

IMPORTANT!

The operation of switches on your hi-ﬁ system may

cause clicks which at high volume settings may aﬀect

your hearing. Therefore, always set the volume

control to minimum before switching between

diﬀerent sources.

WARNING!

. To guarantee your personal safety, please ensure that

these earbuds are not worn kept in the immediate

vicinity (close than 15 cm) of a pacemaker.

· Do not insert jack plug into electric sockets.

· Supervise children when using the device, the product

is not a toy.

· Earbuds listening at high volume levels particularly

over extended periods of time may damage your hearing.

Noise Cancellation Mode and

Ambient Modes

Cycle through Noise

Cancellation Mode ON,

Ambient Mode ON and

ALL OFF

Noise Cancellation Mode: Our noise canceling technology

and optimized passive isolation can suppress wide-band

ambient noise

Ambient Mode: Allows you to hear sounds around you

even while wearing the earbuds

Press thrice X3

QUICK

START

GUIDE

ZEN

Charging cable

USB-C to USB-A

Ear tips

Touch pad

Earbuds LED indicator

Charging case LED indicator

USB-C Connector

Earphone

Charging Case

Packing List

Product Illustration

User Guide

Choose your ear tips

Use the touch pad

Turn On/Turn Off

Pairing

Ear tips (S/M/L X2)

Do not plug the earbuds into your ears without installing ear

tips, as this may damage your ears

Use touch pad to control Music volume / Play / Pause,

Pick/Hang up /Reject call, Noise Cancellation on / off,

Ambient on / off, and activate the Mobile phone's System

voice assistant for conversation

Turn On: Take out two earbuds or any one earbud from

the charging box.

Turn Off: Put the earbuds back into the charging box.

*To avoid hurting your ears, please do not apply excessive

pressure on the touch pad with your ﬁngers (touch pad lightly)

*To avoid damaging the touch pad, please do not click on it

with any sharp objects

*If the mobile device is not connected in 5 minutes, the earbuds

will enter standby mode, you can follow step 2 to re-pair.

* The earbuds are set to Noise Cancellation Mode when powered ON

After putting the earbuds back into the charging case

and then taking out, the earbuds will automatically

connect to a recently connected mobile phone.

1. Pair and connect for the first time

Wear demonstration

After putting the earbuds into the ear, rotate and adjust

the earbud to the right depth and angle to ﬁt the ear

canal (as shown below)

The size M ear tips are attached to the earbuds in-box.

2. Bluetooth remote disconnection and reconnect

3. Turn on to reconnect

①Remove both earbuds from the charging case;

②Put both earbuds into Bluetooth pairing mode;

③Press and hold the touch pad until the LEDs on the

earbuds flash red 3 times;

④Return the earbuds to the charging case and leave

them there for 10 seconds;

⑤The pairing record is now cleared.

* After clearing the pairing record of the earbuds, the

earbuds will enter the pairing mode directly.

4. To clear the pairing record of the earbuds

①Take out the earbuds from the charging case;

②The LEDs on the earbuds flash red and white alternately,

and the earbuds enter pairing mode;

x3 > 00:02

④After a few seconds, a Bluetooth pairing request pop-up

window will appear, press “Pair” to connect the

second earbud;

⑤Enjoy your Zen

③ Find "233621® Zen" on the Bluetooth list to pair the

ﬁrst earbud;

Bluetooth

233621® Zen

Bluetooth

233621® Zen pair

①If the earbuds are disconnected with the mobile

phone and return to the effective connection range

within 10 minutes, Bluetooth will automatically reconnect.

②If the earbuds are disconnected with the mobile

phone and return to the effective range after 10

minutes, Bluetooth needs to be reconnected manually.

Rotate and adjust to 45° angle position

* For the earbuds that are not paired for the ﬁrst time, when

connecting a new mobile phone, you need to touch the pad for any

earbud 3 times in a row, and the third press holding for 2 seconds,

the LEDs flash red and white alternately.

IMPORTANT!

The operation of switches on your hi-ﬁ system may

cause clicks which at high volume settings may aﬀect

your hearing. Therefore, always set the volume

control to minimum before switching between

diﬀerent sources.

WARNING!

. To guarantee your personal safety, please ensure that

these earbuds are not worn kept in the immediate

vicinity (close than 15 cm) of a pacemaker.

· Do not insert jack plug into electric sockets.

· Supervise children when using the device, the product

is not a toy.

· Earbuds listening at high volume levels particularly

over extended periods of time may damage your hearing.

Noise Cancellation Mode and

Ambient Modes

Cycle through Noise

Cancellation Mode ON,

Ambient Mode ON and

ALL OFF

Noise Cancellation Mode: Our noise canceling technology

and optimized passive isolation can suppress wide-band

ambient noise

Ambient Mode: Allows you to hear sounds around you

even while wearing the earbuds

Press thrice X3

QUICK

START

GUIDE

ZEN

Charging cable

USB-C to USB-A

Ear tips

Touch pad

Earbuds LED indicator

Charging case LED indicator

USB-C Connector

Earphone

Charging Case

Packing List

Product Illustration

User Guide

Choose your ear tips

Use the touch pad

Turn On/Turn Off

Pairing

Ear tips (S/M/L X2)

Do not plug the earbuds into your ears without installing ear

tips, as this may damage your ears

Use touch pad to control Music volume / Play / Pause,

Pick/Hang up /Reject call, Noise Cancellation on / off,

Ambient on / off, and activate the Mobile phone's System

voice assistant for conversation

Turn On: Take out two earbuds or any one earbud from

the charging box.

Turn Off: Put the earbuds back into the charging box.

*To avoid hurting your ears, please do not apply excessive

pressure on the touch pad with your ﬁngers (touch pad lightly)

*To avoid damaging the touch pad, please do not click on it

with any sharp objects

*If the mobile device is not connected in 5 minutes, the earbuds

will enter standby mode, you can follow step 2 to re-pair.

* The earbuds are set to Noise Cancellation Mode when powered ON

After putting the earbuds back into the charging case

and then taking out, the earbuds will automatically

connect to a recently connected mobile phone.

1. Pair and connect for the first time

Wear demonstration

After putting the earbuds into the ear, rotate and adjust

the earbud to the right depth and angle to ﬁt the ear

canal (as shown below)

The size M ear tips are attached to the earbuds in-box.

2. Bluetooth remote disconnection and reconnect

3. Turn on to reconnect

①Remove both earbuds from the charging case;

②Put both earbuds into Bluetooth pairing mode;

③Press and hold the touch pad until the LEDs on the

earbuds flash red 3 times;

④Return the earbuds to the charging case and leave

them there for 10 seconds;

⑤The pairing record is now cleared.

* After clearing the pairing record of the earbuds, the

earbuds will enter the pairing mode directly.

4. To clear the pairing record of the earbuds

①Take out the earbuds from the charging case;

②The LEDs on the earbuds flash red and white alternately,

and the earbuds enter pairing mode;

x3 > 00:02

④After a few seconds, a Bluetooth pairing request pop-up

window will appear, press “Pair” to connect the

second earbud;

⑤Enjoy your Zen

③ Find "233621® Zen" on the Bluetooth list to pair the

ﬁrst earbud;

Bluetooth

233621® Zen

Bluetooth

233621® Zen pair

①If the earbuds are disconnected with the mobile

phone and return to the effective connection range

within 10 minutes, Bluetooth will automatically reconnect.

②If the earbuds are disconnected with the mobile

phone and return to the effective range after 10

minutes, Bluetooth needs to be reconnected manually.

Rotate and adjust to 45° angle position

* For the earbuds that are not paired for the ﬁrst time, when

connecting a new mobile phone, you need to touch the pad for any

earbud 3 times in a row, and the third press holding for 2 seconds,

the LEDs flash red and white alternately.

IMPORTANT!

The operation of switches on your hi-ﬁ system may

cause clicks which at high volume settings may aﬀect

your hearing. Therefore, always set the volume

control to minimum before switching between

diﬀerent sources.

WARNING!

. To guarantee your personal safety, please ensure that

these earbuds are not worn kept in the immediate

vicinity (close than 15 cm) of a pacemaker.

· Do not insert jack plug into electric sockets.

· Supervise children when using the device, the product

is not a toy.

· Earbuds listening at high volume levels particularly

over extended periods of time may damage your hearing.

Noise Cancellation Mode and

Ambient Modes

Cycle through Noise

Cancellation Mode ON,

Ambient Mode ON and

ALL OFF

Noise Cancellation Mode: Our noise canceling technology

and optimized passive isolation can suppress wide-band

ambient noise

Ambient Mode: Allows you to hear sounds around you

even while wearing the earbuds

Press thrice X3

QUICK

START

GUIDE

ZEN

Charging cable

USB-C to USB-A

Ear tips

Touch pad

Earbuds LED indicator

Charging case LED indicator

USB-C Connector

Earphone

Charging Case

Packing List

Product Illustration

User Guide

Choose your ear tips

Use the touch pad

Turn On/Turn Off

Pairing

Ear tips (S/M/L X2)

Do not plug the earbuds into your ears without installing ear

tips, as this may damage your ears

Use touch pad to control Music volume / Play / Pause,

Pick/Hang up /Reject call, Noise Cancellation on / off,

Ambient on / off, and activate the Mobile phone's System

voice assistant for conversation

Turn On: Take out two earbuds or any one earbud from

the charging box.

Turn Off: Put the earbuds back into the charging box.

*To avoid hurting your ears, please do not apply excessive

pressure on the touch pad with your ﬁngers (touch pad lightly)

*To avoid damaging the touch pad, please do not click on it

with any sharp objects

*If the mobile device is not connected in 5 minutes, the earbuds

will enter standby mode, you can follow step 2 to re-pair.

* The earbuds are set to Noise Cancellation Mode when powered ON

After putting the earbuds back into the charging case

and then taking out, the earbuds will automatically

connect to a recently connected mobile phone.

1. Pair and connect for the first time

Wear demonstration

After putting the earbuds into the ear, rotate and adjust

the earbud to the right depth and angle to ﬁt the ear

canal (as shown below)

The size M ear tips are attached to the earbuds in-box.

2. Bluetooth remote disconnection and reconnect

3. Turn on to reconnect

①Remove both earbuds from the charging case;

②Put both earbuds into Bluetooth pairing mode;

③Press and hold the touch pad until the LEDs on the

earbuds flash red 3 times;

④Return the earbuds to the charging case and leave

them there for 10 seconds;

⑤The pairing record is now cleared.

* After clearing the pairing record of the earbuds, the

earbuds will enter the pairing mode directly.

4. To clear the pairing record of the earbuds

①Take out the earbuds from the charging case;

②The LEDs on the earbuds flash red and white alternately,

and the earbuds enter pairing mode;

x3 > 00:02

④After a few seconds, a Bluetooth pairing request pop-up

window will appear, press “Pair” to connect the

second earbud;

⑤Enjoy your Zen

③ Find "233621® Zen" on the Bluetooth list to pair the

ﬁrst earbud;

Bluetooth

233621® Zen

Bluetooth

233621® Zen pair

①If the earbuds are disconnected with the mobile

phone and return to the effective connection range

within 10 minutes, Bluetooth will automatically reconnect.

②If the earbuds are disconnected with the mobile

phone and return to the effective range after 10

minutes, Bluetooth needs to be reconnected manually.

Rotate and adjust to 45° angle position

* For the earbuds that are not paired for the ﬁrst time, when

connecting a new mobile phone, you need to touch the pad for any

earbud 3 times in a row, and the third press holding for 2 seconds,

the LEDs flash red and white alternately.

IMPORTANT!

The operation of switches on your hi-ﬁ system may

cause clicks which at high volume settings may aﬀect

your hearing. Therefore, always set the volume

control to minimum before switching between

diﬀerent sources.

WARNING!

. To guarantee your personal safety, please ensure that

these earbuds are not worn kept in the immediate

vicinity (close than 15 cm) of a pacemaker.

· Do not insert jack plug into electric sockets.

· Supervise children when using the device, the product

is not a toy.

· Earbuds listening at high volume levels particularly

over extended periods of time may damage your hearing.

Noise Cancellation Mode and

Ambient Modes

Cycle through Noise

Cancellation Mode ON,

Ambient Mode ON and

ALL OFF

Noise Cancellation Mode: Our noise canceling technology

and optimized passive isolation can suppress wide-band

ambient noise

Ambient Mode: Allows you to hear sounds around you

even while wearing the earbuds

Press thrice X3

QUICK

START

GUIDE

ZEN

Charging cable

USB-C to USB-A

Ear tips

Touch pad

Earbuds LED indicator

Charging case LED indicator

USB-C Connector

Earphone

Charging Case

Packing List

Product Illustration

User Guide

Choose your ear tips

Use the touch pad

Turn On/Turn Off

Pairing

Ear tips (S/M/L X2)

Do not plug the earbuds into your ears without installing ear

tips, as this may damage your ears

Use touch pad to control Music volume / Play / Pause,

Pick/Hang up /Reject call, Noise Cancellation on / off,

Ambient on / off, and activate the Mobile phone's System

voice assistant for conversation

Turn On: Take out two earbuds or any one earbud from

the charging box.

Turn Off: Put the earbuds back into the charging box.

*To avoid hurting your ears, please do not apply excessive

pressure on the touch pad with your ﬁngers (touch pad lightly)

*To avoid damaging the touch pad, please do not click on it

with any sharp objects

*If the mobile device is not connected in 5 minutes, the earbuds

will enter standby mode, you can follow step 2 to re-pair.

* The earbuds are set to Noise Cancellation Mode when powered ON

After putting the earbuds back into the charging case

and then taking out, the earbuds will automatically

connect to a recently connected mobile phone.

1. Pair and connect for the first time

Wear demonstration

After putting the earbuds into the ear, rotate and adjust

the earbud to the right depth and angle to ﬁt the ear

canal (as shown below)

The size M ear tips are attached to the earbuds in-box.

2. Bluetooth remote disconnection and reconnect

3. Turn on to reconnect

①Remove both earbuds from the charging case;

②Put both earbuds into Bluetooth pairing mode;

③Press and hold the touch pad until the LEDs on the

earbuds flash red 3 times;

④Return the earbuds to the charging case and leave

them there for 10 seconds;

⑤The pairing record is now cleared.

* After clearing the pairing record of the earbuds, the

earbuds will enter the pairing mode directly.

4. To clear the pairing record of the earbuds

①Take out the earbuds from the charging case;

②The LEDs on the earbuds flash red and white alternately,

and the earbuds enter pairing mode;

x3 > 00:02

④After a few seconds, a Bluetooth pairing request pop-up

window will appear, press “Pair” to connect the

second earbud;

⑤Enjoy your Zen

③ Find "233621® Zen" on the Bluetooth list to pair the

ﬁrst earbud;

Bluetooth

233621® Zen

Bluetooth

233621® Zen pair

①If the earbuds are disconnected with the mobile

phone and return to the effective connection range

within 10 minutes, Bluetooth will automatically reconnect.

②If the earbuds are disconnected with the mobile

phone and return to the effective range after 10

minutes, Bluetooth needs to be reconnected manually.

Rotate and adjust to 45° angle position

* For the earbuds that are not paired for the ﬁrst time, when

connecting a new mobile phone, you need to touch the pad for any

earbud 3 times in a row, and the third press holding for 2 seconds,

the LEDs flash red and white alternately.

IMPORTANT!

The operation of switches on your hi-ﬁ system may

cause clicks which at high volume settings may aﬀect

your hearing. Therefore, always set the volume

control to minimum before switching between

diﬀerent sources.

WARNING!

. To guarantee your personal safety, please ensure that

these earbuds are not worn kept in the immediate

vicinity (close than 15 cm) of a pacemaker.

· Do not insert jack plug into electric sockets.

· Supervise children when using the device, the product

is not a toy.

· Earbuds listening at high volume levels particularly

over extended periods of time may damage your hearing.

Being Charged

Red light off: Battery Lever 100%

Red light always on: Being Charged

Not being charged

Open / Close the top cover of the

charging case

Flash white quickly: Battery power

is more than 30%

Flash red quickly: Battery power is

less than 30%

Touch function

Charging Case LED Behavior

Functions Operations

Press twice/Put on

Press twice/Remove

Press and hold 2s

Press twice

Press once

Press twice

Operations

Press twice/Put on

Press twice/Remove

Press and hold 2s

Music

Play

Call

Volume

Voice

Pause

Previous song

Next song

Pick/Hang up call

Reject call

Volume+

Volume-

Activate voice

assistant Press twice and the second press hold for 2s

Left earbud Right earbud

Before using and operating the device, read and

follow the precautions below to ensure that the

equipment performs optimally and avoids

dangerous or illegal conditions

Voice Prompts

1. Power on: “Power on”

2. Enter pairing mode: “Looking for the device”

3. Pairing timeout: “Device not found”

4. Paring successful: “Beep”

5. Paring failure: “Beep”

6. Low battery: “Battery low” （≤10%）

7. Noise cancellation on: “Noise cancellation on”

8. Ambient on：“Ambient on”

9. Noise cancellation, Ambient mode are off: “off ”

10. Sound Max / Min：“Beep””

11. Power off: “Power off”

LED Behavior

Earbud LED Behavior

Flash white quickly: Power on but

not connected with any device

Flash white slowly: Power on and

connected with device

Flash red and white quickly:

Pairing mode

Flash red slowly: Battery low

when connected with device

Flash red quickly and slowly:

Charging (the power is less than 30%)

Flash red slowly: Charging (the

power is more than 30%)

LED off: Battery fully charged

Flash red quickly: Battery low

when not connected with any device

Specifications

Model: 233621® Zen

Driver: 10mm neodymium dynamic driver

Audio CODEC support: SBC, AAC, aptX

Frequency response range: 20 - 20,000Hz

Connections: USB-C cable for case charging

Battery charging: A 10-minute charge delivers up to

1-hour playback; less than 2 hours for a full charge

(when charging unit via USB-C cable and charging case)

Playback time: Up to 10 hours, total 22 hours with

charging case

Support: BT 5.0, A2DP v1.3, AVRCP v1.6, HFP v1.7, HSP v1.2

Bluetooth transmission frequency range: 2.402-2.480GHz

Bluetooth transmission power: <8.0dBm

Battery parameters: Single earbud: 3.7V, 85mAh

Charging case: 3.7V,500mAh

Water resistance rating: IPX4 (for earbuds only)

Weight: 6.6g (single earbud),53.6g (both earbuds

and case)

Regulatory Information

Informational Note for Customers

in U.S.A. Only: Product service policy

2. Keep the volume within the allowable range to avoid

hearing damage. Prolonged exposure to high volume

might result in permanent hearing damage.

3. Exposure to high volume while driving may distract

attention and cause an accident.

4. Do not cover, seal or put other items on the device.

5. Keep the device away from heat sources or bare ﬁre

like electric heaters, microwave ovens, stoves, water

heaters, candles or any place with high

temperature conditions.

6. Do not use an external heating appliance such as a

hair dryer or microwave to dry the device.

7. Avoid striking the device and its accessories to a hard

object or vice versa as it may lead the battery to

explode or might cause malfunction.

8. Wipe the device with a clean, dry, soft cloth. Do Not

use the device before cleaning and maintenance.

9. Use and store the device and its accessories in the

temperature range of 5°~35°. When the environmental

temperature is too high or too low, it may cause device

malfunction. The battery efﬁciency would be limited

when the temperature is lower than 5°.

10. Keep the device and its accessories in a ventilated

and cool environment without exposing it to direct sunlight.

11. This device is not a toy and children may use this

device under adult supervision. This device and its

accessories may contain small parts that should

keep away from children. Children may inadvertently

damage the device and its accessories, or swallow

small parts resulting in suffocation or other hazards.

12. The device is equipped with non-removable built-in

rechargeable battery. Do Not replace the battery by

yourself. The battery can only be replaced by

authorized service center.

13. Do not disassemble or modify the device and

accessories without permission, otherwise the device

and accessories will not be covered under warranty,

please contact the authorized service center when

the device malfunction is detected.

14. Do not dispose this device and its accessories as

ordinary household waste. Comply with the local

laws and regulations dealing with this device and its

accessories and support recycling.

15. In medical and health care facilities where the use of

wireless devices is prohibited, comply with the

regulations of such facilities and turn off the device.

16. Radio waves generated by devices may affect the

normal operation of implantable medical devices or

personal medical devices, such as pacemakers,

1. Do not use this device in dusty, humid, dirty

environment or places near magnetic ﬁeld to avoid

malfunction of the internal circuit of the device.

3. “233621” word mark and logos are registered

trademarks of Shenzhen Grandsun Electronics

Co., Ltd. Reproduction in whole or in part without

written permission is prohibited. Other companies

and products mentioned herein are trademarks of

their respective owners.

Made in China.

1. The device warranty period is 12 months from the

date of purchase. Repair and maintenance service

are free during the warranty period, excluding

malfunctions are man-made.

2. The limited warranty shall not apply to:

a. man-made damage;

b. exceed the warranty period;

c. no warranty card and valid invoice (except those

can prove the product is under the warranty period);

d. the warranty card is altered or not complied with

the device itself;

e. the SN label on device is torn off (except those can

provide warranty card and efﬁciency invoice);

f. accessories damage due to improper use

and maintenance;

g. disassemble or amend the device without

manufacturer authority or water and smashing damages;

h. damages due to force majeure.

3. Service Information

233621 Website:www.233621.com

1. You are cautioned that any changes or modiﬁcations

not expressly approved in this manual could void your

authority to operate this device.

2. This device complies with Part 15 of the FCC Rules.

Operation is subject to the following two conditions:

(1) this device may not cause harmful interference

(2) this device must accept any interference received,

including interference that may cause undesired operation.

3. This device has been tested and found to comply with

the limits for a Class B digital device, pursuant to part

15 of the FCC Rules. These limits are designed to

provide reasonable protection against harmful

interference in a residential installation. This device

generates, uses and can radiate radio frequency

energy and, if not installed and used in accordance

with the instructions, may cause harmful interference

to radio communications. However, there is no

guarantee that interference will not occur in a

particular installation. If this device does cause

harmful interference to radio or television reception,

which can be determined by turning the device off

and on, the user is encouraged to try to correct the

interference by one or more of the following measures:

(1) Reorient or relocate the receiving antenna.

(2) Increase the separation between the device

and receiver.

(3) Connect the device into an outlet on a circuit

different from that to which the receiver is connected.

(4) Consult the dealer or an experienced radio/TV

technician for help.

4. This device must not be co-located or operated in

conjunction with any other antenna or transmitter.

cochlear implants, hearing aids, etc. If you use any

of these medical devices, consult their manufacturer

about the use restrictions of the device.

17. Keep the device at least 15cm away from the

implanted medical device such as pacemaker,

cochlear implants etc.

18. Use of unauthorized or incompatible power supplies,

chargers or batteries may cause ﬁre, explosion or

other hazards.

Informational Note for Customers

in EU Only:

This device has been manufactured by or on behalf of

Shenzhen Grandsun Electronics Co., Ltd. Hereby,

Shenzhen Grandsun Electronics Co., Ltd. declares that

this device is in compliance with Directive 2014/53/EU.

This symbol on the device, the battery or on

the packaging indicates that the device and

the battery shall not be treated as household

waste. By ensuring these devices and

batteries are disposed of correctly, you will

help prevent potentially negative

consequences for the environment and

human health which could otherwise be caused by

inappropriate waste handling. The recycling of the

materials will help to conserve natural resources. In

case of devices that for safety, performance or data

integrity reasons require a permanent connection

with an incorporated battery, this battery should be

replaced by qualiﬁed service staﬀ only. To ensure that

the battery and the electrical and electronic device

will be treated properly, hand over these devices at

end-of-life to the applicable collection point for the

recycling of electrical and electronic device. Hand the

battery over to the applicable collection point for the

recycling of waste batteries. For more detailed

information about recycling of this device or battery,

please contact your local Civic Oﬃce, your household

waste disposal service or the dealer.

This symbol is only valid in the European Union.

1. The Bluetooth® word mark and logos are registered

trademarks owned by Bluetooth SIG. Inc. And any use

of such marks by Shenzhen Grandsun Electronics

Co., Ltd. is under license.

2. Qualcomm aptX is a product of Qualcomm

Technologies International, Ltd. Qualcomm is a

trademark of Qualcomm Incorporated, registered in

the United States and other countries, used with

permission. aptX is a trademark of Qualcomm

Technologies International, Ltd., registered in the

United States and other countries, used with permission.

Trademarks

Being Charged

Red light off: Battery Lever 100%

Red light always on: Being Charged

Not being charged

Open / Close the top cover of the

charging case

Flash white quickly: Battery power

is more than 30%

Flash red quickly: Battery power is

less than 30%

Touch function

Charging Case LED Behavior

Functions Operations

Press twice/Put on

Press twice/Remove

Press and hold 2s

Press twice

Press once

Press twice

Operations

Press twice/Put on

Press twice/Remove

Press and hold 2s

Music

Play

Call

Volume

Voice

Pause

Previous song

Next song

Pick/Hang up call

Reject call

Volume+

Volume-

Activate voice

assistant Press twice and the second press hold for 2s

Left earbud Right earbud

Before using and operating the device, read and

follow the precautions below to ensure that the

equipment performs optimally and avoids

dangerous or illegal conditions

Voice Prompts

1. Power on: “Power on”

2. Enter pairing mode: “Looking for the device”

3. Pairing timeout: “Device not found”

4. Paring successful: “Beep”

5. Paring failure: “Beep”

6. Low battery: “Battery low” （≤10%）

7. Noise cancellation on: “Noise cancellation on”

8. Ambient on：“Ambient on”

9. Noise cancellation, Ambient mode are off: “off ”

10. Sound Max / Min：“Beep””

11. Power off: “Power off”

LED Behavior

Earbud LED Behavior

Flash white quickly: Power on but

not connected with any device

Flash white slowly: Power on and

connected with device

Flash red and white quickly:

Pairing mode

Flash red slowly: Battery low

when connected with device

Flash red quickly and slowly:

Charging (the power is less than 30%)

Flash red slowly: Charging (the

power is more than 30%)

LED off: Battery fully charged

Flash red quickly: Battery low

when not connected with any device

Specifications

Model: 233621® Zen

Driver: 10mm neodymium dynamic driver

Audio CODEC support: SBC, AAC, aptX

Frequency response range: 20 - 20,000Hz

Connections: USB-C cable for case charging

Battery charging: A 10-minute charge delivers up to

1-hour playback; less than 2 hours for a full charge

(when charging unit via USB-C cable and charging case)

Playback time: Up to 10 hours, total 22 hours with

charging case

Support: BT 5.0, A2DP v1.3, AVRCP v1.6, HFP v1.7, HSP v1.2

Bluetooth transmission frequency range: 2.402-2.480GHz

Bluetooth transmission power: <8.0dBm

Battery parameters: Single earbud: 3.7V, 85mAh

Charging case: 3.7V,500mAh

Water resistance rating: IPX4 (for earbuds only)

Weight: 6.6g (single earbud),53.6g (both earbuds

and case)

Regulatory Information

Informational Note for Customers

in U.S.A. Only: Product service policy

2. Keep the volume within the allowable range to avoid

hearing damage. Prolonged exposure to high volume

might result in permanent hearing damage.

3. Exposure to high volume while driving may distract

attention and cause an accident.

4. Do not cover, seal or put other items on the device.

5. Keep the device away from heat sources or bare ﬁre

like electric heaters, microwave ovens, stoves, water

heaters, candles or any place with high

temperature conditions.

6. Do not use an external heating appliance such as a

hair dryer or microwave to dry the device.

7. Avoid striking the device and its accessories to a hard

object or vice versa as it may lead the battery to

explode or might cause malfunction.

8. Wipe the device with a clean, dry, soft cloth. Do Not

use the device before cleaning and maintenance.

9. Use and store the device and its accessories in the

temperature range of 5°~35°. When the environmental

temperature is too high or too low, it may cause device

malfunction. The battery efﬁciency would be limited

when the temperature is lower than 5°.

10. Keep the device and its accessories in a ventilated

and cool environment without exposing it to direct sunlight.

11. This device is not a toy and children may use this

device under adult supervision. This device and its

accessories may contain small parts that should

keep away from children. Children may inadvertently

damage the device and its accessories, or swallow

small parts resulting in suffocation or other hazards.

12. The device is equipped with non-removable built-in

rechargeable battery. Do Not replace the battery by

yourself. The battery can only be replaced by

authorized service center.

13. Do not disassemble or modify the device and

accessories without permission, otherwise the device

and accessories will not be covered under warranty,

please contact the authorized service center when

the device malfunction is detected.

14. Do not dispose this device and its accessories as

ordinary household waste. Comply with the local

laws and regulations dealing with this device and its

accessories and support recycling.

15. In medical and health care facilities where the use of

wireless devices is prohibited, comply with the

regulations of such facilities and turn off the device.

16. Radio waves generated by devices may affect the

normal operation of implantable medical devices or

personal medical devices, such as pacemakers,

1. Do not use this device in dusty, humid, dirty

environment or places near magnetic ﬁeld to avoid

malfunction of the internal circuit of the device.

3. “233621” word mark and logos are registered

trademarks of Shenzhen Grandsun Electronics

Co., Ltd. Reproduction in whole or in part without

written permission is prohibited. Other companies

and products mentioned herein are trademarks of

their respective owners.

Made in China.

1. The device warranty period is 12 months from the

date of purchase. Repair and maintenance service

are free during the warranty period, excluding

malfunctions are man-made.

2. The limited warranty shall not apply to:

a. man-made damage;

b. exceed the warranty period;

c. no warranty card and valid invoice (except those

can prove the product is under the warranty period);

d. the warranty card is altered or not complied with

the device itself;

e. the SN label on device is torn off (except those can

provide warranty card and efﬁciency invoice);

f. accessories damage due to improper use

and maintenance;

g. disassemble or amend the device without

manufacturer authority or water and smashing damages;

h. damages due to force majeure.

3. Service Information

233621 Website:www.233621.com

1. You are cautioned that any changes or modiﬁcations

not expressly approved in this manual could void your

authority to operate this device.

2. This device complies with Part 15 of the FCC Rules.

Operation is subject to the following two conditions:

(1) this device may not cause harmful interference

(2) this device must accept any interference received,

including interference that may cause undesired operation.

3. This device has been tested and found to comply with

the limits for a Class B digital device, pursuant to part

15 of the FCC Rules. These limits are designed to

provide reasonable protection against harmful

interference in a residential installation. This device

generates, uses and can radiate radio frequency

energy and, if not installed and used in accordance

with the instructions, may cause harmful interference

to radio communications. However, there is no

guarantee that interference will not occur in a

particular installation. If this device does cause

harmful interference to radio or television reception,

which can be determined by turning the device off

and on, the user is encouraged to try to correct the

interference by one or more of the following measures:

(1) Reorient or relocate the receiving antenna.

(2) Increase the separation between the device

and receiver.

(3) Connect the device into an outlet on a circuit

different from that to which the receiver is connected.

(4) Consult the dealer or an experienced radio/TV

technician for help.

4. This device must not be co-located or operated in

conjunction with any other antenna or transmitter.

cochlear implants, hearing aids, etc. If you use any

of these medical devices, consult their manufacturer

about the use restrictions of the device.

17. Keep the device at least 15cm away from the

implanted medical device such as pacemaker,

cochlear implants etc.

18. Use of unauthorized or incompatible power supplies,

chargers or batteries may cause ﬁre, explosion or

other hazards.

Informational Note for Customers

in EU Only:

This device has been manufactured by or on behalf of

Shenzhen Grandsun Electronics Co., Ltd. Hereby,

Shenzhen Grandsun Electronics Co., Ltd. declares that

this device is in compliance with Directive 2014/53/EU.

This symbol on the device, the battery or on

the packaging indicates that the device and

the battery shall not be treated as household

waste. By ensuring these devices and

batteries are disposed of correctly, you will

help prevent potentially negative

consequences for the environment and

human health which could otherwise be caused by

inappropriate waste handling. The recycling of the

materials will help to conserve natural resources. In

case of devices that for safety, performance or data

integrity reasons require a permanent connection

with an incorporated battery, this battery should be

replaced by qualiﬁed service staﬀ only. To ensure that

the battery and the electrical and electronic device

will be treated properly, hand over these devices at

end-of-life to the applicable collection point for the

recycling of electrical and electronic device. Hand the

battery over to the applicable collection point for the

recycling of waste batteries. For more detailed

information about recycling of this device or battery,

please contact your local Civic Oﬃce, your household

waste disposal service or the dealer.

This symbol is only valid in the European Union.

1. The Bluetooth® word mark and logos are registered

trademarks owned by Bluetooth SIG. Inc. And any use

of such marks by Shenzhen Grandsun Electronics

Co., Ltd. is under license.

2. Qualcomm aptX is a product of Qualcomm

Technologies International, Ltd. Qualcomm is a

trademark of Qualcomm Incorporated, registered in

the United States and other countries, used with

permission. aptX is a trademark of Qualcomm

Technologies International, Ltd., registered in the

United States and other countries, used with permission.

Trademarks

Being Charged

Red light off: Battery Lever 100%

Red light always on: Being Charged

Not being charged

Open / Close the top cover of the

charging case

Flash white quickly: Battery power

is more than 30%

Flash red quickly: Battery power is

less than 30%

Touch function

Charging Case LED Behavior

Functions Operations

Press twice/Put on

Press twice/Remove

Press and hold 2s

Press twice

Press once

Press twice

Operations

Press twice/Put on

Press twice/Remove

Press and hold 2s

Music

Play

Call

Volume

Voice

Pause

Previous song

Next song

Pick/Hang up call

Reject call

Volume+

Volume-

Activate voice

assistant Press twice and the second press hold for 2s

Left earbud Right earbud

Before using and operating the device, read and

follow the precautions below to ensure that the

equipment performs optimally and avoids

dangerous or illegal conditions

Voice Prompts

1. Power on: “Power on”

2. Enter pairing mode: “Looking for the device”

3. Pairing timeout: “Device not found”

4. Paring successful: “Beep”

5. Paring failure: “Beep”

6. Low battery: “Battery low” （≤10%）

7. Noise cancellation on: “Noise cancellation on”

8. Ambient on：“Ambient on”

9. Noise cancellation, Ambient mode are off: “off ”

10. Sound Max / Min：“Beep””

11. Power off: “Power off”

LED Behavior

Earbud LED Behavior

Flash white quickly: Power on but

not connected with any device

Flash white slowly: Power on and

connected with device

Flash red and white quickly:

Pairing mode

Flash red slowly: Battery low

when connected with device

Flash red quickly and slowly:

Charging (the power is less than 30%)

Flash red slowly: Charging (the

power is more than 30%)

LED off: Battery fully charged

Flash red quickly: Battery low

when not connected with any device

Specifications

Model: 233621® Zen

Driver: 10mm neodymium dynamic driver

Audio CODEC support: SBC, AAC, aptX

Frequency response range: 20 - 20,000Hz

Connections: USB-C cable for case charging

Battery charging: A 10-minute charge delivers up to

1-hour playback; less than 2 hours for a full charge

(when charging unit via USB-C cable and charging case)

Playback time: Up to 10 hours, total 22 hours with

charging case

Support: BT 5.0, A2DP v1.3, AVRCP v1.6, HFP v1.7, HSP v1.2

Bluetooth transmission frequency range: 2.402-2.480GHz

Bluetooth transmission power: <8.0dBm

Battery parameters: Single earbud: 3.7V, 85mAh

Charging case: 3.7V,500mAh

Water resistance rating: IPX4 (for earbuds only)

Weight: 6.6g (single earbud),53.6g (both earbuds

and case)

Regulatory Information

Informational Note for Customers

in U.S.A. Only: Product service policy

2. Keep the volume within the allowable range to avoid

hearing damage. Prolonged exposure to high volume

might result in permanent hearing damage.

3. Exposure to high volume while driving may distract

attention and cause an accident.

4. Do not cover, seal or put other items on the device.

5. Keep the device away from heat sources or bare ﬁre

like electric heaters, microwave ovens, stoves, water

heaters, candles or any place with high

temperature conditions.

6. Do not use an external heating appliance such as a

hair dryer or microwave to dry the device.

7. Avoid striking the device and its accessories to a hard

object or vice versa as it may lead the battery to

explode or might cause malfunction.

8. Wipe the device with a clean, dry, soft cloth. Do Not

use the device before cleaning and maintenance.

9. Use and store the device and its accessories in the

temperature range of 5°~35°. When the environmental

temperature is too high or too low, it may cause device

malfunction. The battery efﬁciency would be limited

when the temperature is lower than 5°.

10. Keep the device and its accessories in a ventilated

and cool environment without exposing it to direct sunlight.

11. This device is not a toy and children may use this

device under adult supervision. This device and its

accessories may contain small parts that should

keep away from children. Children may inadvertently

damage the device and its accessories, or swallow

small parts resulting in suffocation or other hazards.

12. The device is equipped with non-removable built-in

rechargeable battery. Do Not replace the battery by

yourself. The battery can only be replaced by

authorized service center.

13. Do not disassemble or modify the device and

accessories without permission, otherwise the device

and accessories will not be covered under warranty,

please contact the authorized service center when

the device malfunction is detected.

14. Do not dispose this device and its accessories as

ordinary household waste. Comply with the local

laws and regulations dealing with this device and its

accessories and support recycling.

15. In medical and health care facilities where the use of

wireless devices is prohibited, comply with the

regulations of such facilities and turn off the device.

16. Radio waves generated by devices may affect the

normal operation of implantable medical devices or

personal medical devices, such as pacemakers,

1. Do not use this device in dusty, humid, dirty

environment or places near magnetic ﬁeld to avoid

malfunction of the internal circuit of the device.

3. “233621” word mark and logos are registered

trademarks of Shenzhen Grandsun Electronics

Co., Ltd. Reproduction in whole or in part without

written permission is prohibited. Other companies

and products mentioned herein are trademarks of

their respective owners.

Made in China.

1. The device warranty period is 12 months from the

date of purchase. Repair and maintenance service

are free during the warranty period, excluding

malfunctions are man-made.

2. The limited warranty shall not apply to:

a. man-made damage;

b. exceed the warranty period;

c. no warranty card and valid invoice (except those

can prove the product is under the warranty period);

d. the warranty card is altered or not complied with

the device itself;

e. the SN label on device is torn off (except those can

provide warranty card and efﬁciency invoice);

f. accessories damage due to improper use

and maintenance;

g. disassemble or amend the device without

manufacturer authority or water and smashing damages;

h. damages due to force majeure.

3. Service Information

233621 Website:www.233621.com

1. You are cautioned that any changes or modiﬁcations

not expressly approved in this manual could void your

authority to operate this device.

2. This device complies with Part 15 of the FCC Rules.

Operation is subject to the following two conditions:

(1) this device may not cause harmful interference

(2) this device must accept any interference received,

including interference that may cause undesired operation.

3. This device has been tested and found to comply with

the limits for a Class B digital device, pursuant to part

15 of the FCC Rules. These limits are designed to

provide reasonable protection against harmful

interference in a residential installation. This device

generates, uses and can radiate radio frequency

energy and, if not installed and used in accordance

with the instructions, may cause harmful interference

to radio communications. However, there is no

guarantee that interference will not occur in a

particular installation. If this device does cause

harmful interference to radio or television reception,

which can be determined by turning the device off

and on, the user is encouraged to try to correct the

interference by one or more of the following measures:

(1) Reorient or relocate the receiving antenna.

(2) Increase the separation between the device

and receiver.

(3) Connect the device into an outlet on a circuit

different from that to which the receiver is connected.

(4) Consult the dealer or an experienced radio/TV

technician for help.

4. This device must not be co-located or operated in

conjunction with any other antenna or transmitter.

cochlear implants, hearing aids, etc. If you use any

of these medical devices, consult their manufacturer

about the use restrictions of the device.

17. Keep the device at least 15cm away from the

implanted medical device such as pacemaker,

cochlear implants etc.

18. Use of unauthorized or incompatible power supplies,

chargers or batteries may cause ﬁre, explosion or

other hazards.

Informational Note for Customers

in EU Only:

This device has been manufactured by or on behalf of

Shenzhen Grandsun Electronics Co., Ltd. Hereby,

Shenzhen Grandsun Electronics Co., Ltd. declares that

this device is in compliance with Directive 2014/53/EU.

This symbol on the device, the battery or on

the packaging indicates that the device and

the battery shall not be treated as household

waste. By ensuring these devices and

batteries are disposed of correctly, you will

help prevent potentially negative

consequences for the environment and

human health which could otherwise be caused by

inappropriate waste handling. The recycling of the

materials will help to conserve natural resources. In

case of devices that for safety, performance or data

integrity reasons require a permanent connection

with an incorporated battery, this battery should be

replaced by qualiﬁed service staﬀ only. To ensure that

the battery and the electrical and electronic device

will be treated properly, hand over these devices at

end-of-life to the applicable collection point for the

recycling of electrical and electronic device. Hand the

battery over to the applicable collection point for the

recycling of waste batteries. For more detailed

information about recycling of this device or battery,

please contact your local Civic Oﬃce, your household

waste disposal service or the dealer.

This symbol is only valid in the European Union.

1. The Bluetooth® word mark and logos are registered

trademarks owned by Bluetooth SIG. Inc. And any use

of such marks by Shenzhen Grandsun Electronics

Co., Ltd. is under license.

2. Qualcomm aptX is a product of Qualcomm

Technologies International, Ltd. Qualcomm is a

trademark of Qualcomm Incorporated, registered in

the United States and other countries, used with

permission. aptX is a trademark of Qualcomm

Technologies International, Ltd., registered in the

United States and other countries, used with permission.

Trademarks

Being Charged

Red light off: Battery Lever 100%

Red light always on: Being Charged

Not being charged

Open / Close the top cover of the

charging case

Flash white quickly: Battery power

is more than 30%

Flash red quickly: Battery power is

less than 30%

Touch function

Charging Case LED Behavior

Functions Operations

Press twice/Put on

Press twice/Remove

Press and hold 2s

Press twice

Press once

Press twice

Operations

Press twice/Put on

Press twice/Remove

Press and hold 2s

Music

Play

Call

Volume

Voice

Pause

Previous song

Next song

Pick/Hang up call

Reject call

Volume+

Volume-

Activate voice

assistant Press twice and the second press hold for 2s

Left earbud Right earbud

Before using and operating the device, read and

follow the precautions below to ensure that the

equipment performs optimally and avoids

dangerous or illegal conditions

Voice Prompts

1. Power on: “Power on”

2. Enter pairing mode: “Looking for the device”

3. Pairing timeout: “Device not found”

4. Paring successful: “Beep”

5. Paring failure: “Beep”

6. Low battery: “Battery low” （≤10%）

7. Noise cancellation on: “Noise cancellation on”

8. Ambient on：“Ambient on”

9. Noise cancellation, Ambient mode are off: “off ”

10. Sound Max / Min：“Beep””

11. Power off: “Power off”

LED Behavior

Earbud LED Behavior

Flash white quickly: Power on but

not connected with any device

Flash white slowly: Power on and

connected with device

Flash red and white quickly:

Pairing mode

Flash red slowly: Battery low

when connected with device

Flash red quickly and slowly:

Charging (the power is less than 30%)

Flash red slowly: Charging (the

power is more than 30%)

LED off: Battery fully charged

Flash red quickly: Battery low

when not connected with any device

Specifications

Model: 233621® Zen

Driver: 10mm neodymium dynamic driver

Audio CODEC support: SBC, AAC, aptX

Frequency response range: 20 - 20,000Hz

Connections: USB-C cable for case charging

Battery charging: A 10-minute charge delivers up to

1-hour playback; less than 2 hours for a full charge

(when charging unit via USB-C cable and charging case)

Playback time: Up to 10 hours, total 22 hours with

charging case

Support: BT 5.0, A2DP v1.3, AVRCP v1.6, HFP v1.7, HSP v1.2

Bluetooth transmission frequency range: 2.402-2.480GHz

Bluetooth transmission power: <8.0dBm

Battery parameters: Single earbud: 3.7V, 85mAh

Charging case: 3.7V,500mAh

Water resistance rating: IPX4 (for earbuds only)

Weight: 6.6g (single earbud),53.6g (both earbuds

and case)

Regulatory Information

Informational Note for Customers

in U.S.A. Only: Product service policy

2. Keep the volume within the allowable range to avoid

hearing damage. Prolonged exposure to high volume

might result in permanent hearing damage.

3. Exposure to high volume while driving may distract

attention and cause an accident.

4. Do not cover, seal or put other items on the device.

5. Keep the device away from heat sources or bare ﬁre

like electric heaters, microwave ovens, stoves, water

heaters, candles or any place with high

temperature conditions.

6. Do not use an external heating appliance such as a

hair dryer or microwave to dry the device.

7. Avoid striking the device and its accessories to a hard

object or vice versa as it may lead the battery to

explode or might cause malfunction.

8. Wipe the device with a clean, dry, soft cloth. Do Not

use the device before cleaning and maintenance.

9. Use and store the device and its accessories in the

temperature range of 5°~35°. When the environmental

temperature is too high or too low, it may cause device

malfunction. The battery efﬁciency would be limited

when the temperature is lower than 5°.

10. Keep the device and its accessories in a ventilated

and cool environment without exposing it to direct sunlight.

11. This device is not a toy and children may use this

device under adult supervision. This device and its

accessories may contain small parts that should

keep away from children. Children may inadvertently

damage the device and its accessories, or swallow

small parts resulting in suffocation or other hazards.

12. The device is equipped with non-removable built-in

rechargeable battery. Do Not replace the battery by

yourself. The battery can only be replaced by

authorized service center.

13. Do not disassemble or modify the device and

accessories without permission, otherwise the device

and accessories will not be covered under warranty,

please contact the authorized service center when

the device malfunction is detected.

14. Do not dispose this device and its accessories as

ordinary household waste. Comply with the local

laws and regulations dealing with this device and its

accessories and support recycling.

15. In medical and health care facilities where the use of

wireless devices is prohibited, comply with the

regulations of such facilities and turn off the device.

16. Radio waves generated by devices may affect the

normal operation of implantable medical devices or

personal medical devices, such as pacemakers,

1. Do not use this device in dusty, humid, dirty

environment or places near magnetic ﬁeld to avoid

malfunction of the internal circuit of the device.

3. “233621” word mark and logos are registered

trademarks of Shenzhen Grandsun Electronics

Co., Ltd. Reproduction in whole or in part without

written permission is prohibited. Other companies

and products mentioned herein are trademarks of

their respective owners.

Made in China.

1. The device warranty period is 12 months from the

date of purchase. Repair and maintenance service

are free during the warranty period, excluding

malfunctions are man-made.

2. The limited warranty shall not apply to:

a. man-made damage;

b. exceed the warranty period;

c. no warranty card and valid invoice (except those

can prove the product is under the warranty period);

d. the warranty card is altered or not complied with

the device itself;

e. the SN label on device is torn off (except those can

provide warranty card and efﬁciency invoice);

f. accessories damage due to improper use

and maintenance;

g. disassemble or amend the device without

manufacturer authority or water and smashing damages;

h. damages due to force majeure.

3. Service Information

233621 Website:www.233621.com

1. You are cautioned that any changes or modiﬁcations

not expressly approved in this manual could void your

authority to operate this device.

2. This device complies with Part 15 of the FCC Rules.

Operation is subject to the following two conditions:

(1) this device may not cause harmful interference

(2) this device must accept any interference received,

including interference that may cause undesired operation.

3. This device has been tested and found to comply with

the limits for a Class B digital device, pursuant to part

15 of the FCC Rules. These limits are designed to

provide reasonable protection against harmful

interference in a residential installation. This device

generates, uses and can radiate radio frequency

energy and, if not installed and used in accordance

with the instructions, may cause harmful interference

to radio communications. However, there is no

guarantee that interference will not occur in a

particular installation. If this device does cause

harmful interference to radio or television reception,

which can be determined by turning the device off

and on, the user is encouraged to try to correct the

interference by one or more of the following measures:

(1) Reorient or relocate the receiving antenna.

(2) Increase the separation between the device

and receiver.

(3) Connect the device into an outlet on a circuit

different from that to which the receiver is connected.

(4) Consult the dealer or an experienced radio/TV

technician for help.

4. This device must not be co-located or operated in

conjunction with any other antenna or transmitter.

cochlear implants, hearing aids, etc. If you use any

of these medical devices, consult their manufacturer

about the use restrictions of the device.

17. Keep the device at least 15cm away from the

implanted medical device such as pacemaker,

cochlear implants etc.

18. Use of unauthorized or incompatible power supplies,

chargers or batteries may cause ﬁre, explosion or

other hazards.

Informational Note for Customers

in EU Only:

This device has been manufactured by or on behalf of

Shenzhen Grandsun Electronics Co., Ltd. Hereby,

Shenzhen Grandsun Electronics Co., Ltd. declares that

this device is in compliance with Directive 2014/53/EU.

This symbol on the device, the battery or on

the packaging indicates that the device and

the battery shall not be treated as household

waste. By ensuring these devices and

batteries are disposed of correctly, you will

help prevent potentially negative

consequences for the environment and

human health which could otherwise be caused by

inappropriate waste handling. The recycling of the

materials will help to conserve natural resources. In

case of devices that for safety, performance or data

integrity reasons require a permanent connection

with an incorporated battery, this battery should be

replaced by qualiﬁed service staﬀ only. To ensure that

the battery and the electrical and electronic device

will be treated properly, hand over these devices at

end-of-life to the applicable collection point for the

recycling of electrical and electronic device. Hand the

battery over to the applicable collection point for the

recycling of waste batteries. For more detailed

information about recycling of this device or battery,

please contact your local Civic Oﬃce, your household

waste disposal service or the dealer.

This symbol is only valid in the European Union.

1. The Bluetooth® word mark and logos are registered

trademarks owned by Bluetooth SIG. Inc. And any use

of such marks by Shenzhen Grandsun Electronics

Co., Ltd. is under license.

2. Qualcomm aptX is a product of Qualcomm

Technologies International, Ltd. Qualcomm is a

trademark of Qualcomm Incorporated, registered in

the United States and other countries, used with

permission. aptX is a trademark of Qualcomm

Technologies International, Ltd., registered in the

United States and other countries, used with permission.

Trademarks

Being Charged

Red light off: Battery Lever 100%

Red light always on: Being Charged

Not being charged

Open / Close the top cover of the

charging case

Flash white quickly: Battery power

is more than 30%

Flash red quickly: Battery power is

less than 30%

Touch function

Charging Case LED Behavior

Functions Operations

Press twice/Put on

Press twice/Remove

Press and hold 2s

Press twice

Press once

Press twice

Operations

Press twice/Put on

Press twice/Remove

Press and hold 2s

Music

Play

Call

Volume

Voice

Pause

Previous song

Next song

Pick/Hang up call

Reject call

Volume+

Volume-

Activate voice

assistant Press twice and the second press hold for 2s

Left earbud Right earbud

Before using and operating the device, read and

follow the precautions below to ensure that the

equipment performs optimally and avoids

dangerous or illegal conditions

Voice Prompts

1. Power on: “Power on”

2. Enter pairing mode: “Looking for the device”

3. Pairing timeout: “Device not found”

4. Paring successful: “Beep”

5. Paring failure: “Beep”

6. Low battery: “Battery low” （≤10%）

7. Noise cancellation on: “Noise cancellation on”

8. Ambient on：“Ambient on”

9. Noise cancellation, Ambient mode are off: “off ”

10. Sound Max / Min：“Beep””

11. Power off: “Power off”

LED Behavior

Earbud LED Behavior

Flash white quickly: Power on but

not connected with any device

Flash white slowly: Power on and

connected with device

Flash red and white quickly:

Pairing mode

Flash red slowly: Battery low

when connected with device

Flash red quickly and slowly:

Charging (the power is less than 30%)

Flash red slowly: Charging (the

power is more than 30%)

LED off: Battery fully charged

Flash red quickly: Battery low

when not connected with any device

Specifications

Model: 233621® Zen

Driver: 10mm neodymium dynamic driver

Audio CODEC support: SBC, AAC, aptX

Frequency response range: 20 - 20,000Hz

Connections: USB-C cable for case charging

Battery charging: A 10-minute charge delivers up to

1-hour playback; less than 2 hours for a full charge

(when charging unit via USB-C cable and charging case)

Playback time: Up to 10 hours, total 22 hours with

charging case

Support: BT 5.0, A2DP v1.3, AVRCP v1.6, HFP v1.7, HSP v1.2

Bluetooth transmission frequency range: 2.402-2.480GHz

Bluetooth transmission power: <8.0dBm

Battery parameters: Single earbud: 3.7V, 85mAh

Charging case: 3.7V,500mAh

Water resistance rating: IPX4 (for earbuds only)

Weight: 6.6g (single earbud),53.6g (both earbuds

and case)

Regulatory Information

Informational Note for Customers

in U.S.A. Only: Product service policy

2. Keep the volume within the allowable range to avoid

hearing damage. Prolonged exposure to high volume

might result in permanent hearing damage.

3. Exposure to high volume while driving may distract

attention and cause an accident.

4. Do not cover, seal or put other items on the device.

5. Keep the device away from heat sources or bare ﬁre

like electric heaters, microwave ovens, stoves, water

heaters, candles or any place with high

temperature conditions.

6. Do not use an external heating appliance such as a

hair dryer or microwave to dry the device.

7. Avoid striking the device and its accessories to a hard

object or vice versa as it may lead the battery to

explode or might cause malfunction.

8. Wipe the device with a clean, dry, soft cloth. Do Not

use the device before cleaning and maintenance.

9. Use and store the device and its accessories in the

temperature range of 5°~35°. When the environmental

temperature is too high or too low, it may cause device

malfunction. The battery efﬁciency would be limited

when the temperature is lower than 5°.

10. Keep the device and its accessories in a ventilated

and cool environment without exposing it to direct sunlight.

11. This device is not a toy and children may use this

device under adult supervision. This device and its

accessories may contain small parts that should

keep away from children. Children may inadvertently

damage the device and its accessories, or swallow

small parts resulting in suffocation or other hazards.

12. The device is equipped with non-removable built-in

rechargeable battery. Do Not replace the battery by

yourself. The battery can only be replaced by

authorized service center.

13. Do not disassemble or modify the device and

accessories without permission, otherwise the device

and accessories will not be covered under warranty,

please contact the authorized service center when

the device malfunction is detected.

14. Do not dispose this device and its accessories as

ordinary household waste. Comply with the local

laws and regulations dealing with this device and its

accessories and support recycling.

15. In medical and health care facilities where the use of

wireless devices is prohibited, comply with the

regulations of such facilities and turn off the device.

16. Radio waves generated by devices may affect the

normal operation of implantable medical devices or

personal medical devices, such as pacemakers,

1. Do not use this device in dusty, humid, dirty

environment or places near magnetic ﬁeld to avoid

malfunction of the internal circuit of the device.

3. “233621” word mark and logos are registered

trademarks of Shenzhen Grandsun Electronics

Co., Ltd. Reproduction in whole or in part without

written permission is prohibited. Other companies

and products mentioned herein are trademarks of

their respective owners.

Made in China.

1. The device warranty period is 12 months from the

date of purchase. Repair and maintenance service

are free during the warranty period, excluding

malfunctions are man-made.

2. The limited warranty shall not apply to:

a. man-made damage;

b. exceed the warranty period;

c. no warranty card and valid invoice (except those

can prove the product is under the warranty period);

d. the warranty card is altered or not complied with

the device itself;

e. the SN label on device is torn off (except those can

provide warranty card and efﬁciency invoice);

f. accessories damage due to improper use

and maintenance;

g. disassemble or amend the device without

manufacturer authority or water and smashing damages;

h. damages due to force majeure.

3. Service Information

233621 Website:www.233621.com

1. You are cautioned that any changes or modiﬁcations

not expressly approved in this manual could void your

authority to operate this device.

2. This device complies with Part 15 of the FCC Rules.

Operation is subject to the following two conditions:

(1) this device may not cause harmful interference

(2) this device must accept any interference received,

including interference that may cause undesired operation.

3. This device has been tested and found to comply with

the limits for a Class B digital device, pursuant to part

15 of the FCC Rules. These limits are designed to

provide reasonable protection against harmful

interference in a residential installation. This device

generates, uses and can radiate radio frequency

energy and, if not installed and used in accordance

with the instructions, may cause harmful interference

to radio communications. However, there is no

guarantee that interference will not occur in a

particular installation. If this device does cause

harmful interference to radio or television reception,

which can be determined by turning the device off

and on, the user is encouraged to try to correct the

interference by one or more of the following measures:

(1) Reorient or relocate the receiving antenna.

(2) Increase the separation between the device

and receiver.

(3) Connect the device into an outlet on a circuit

different from that to which the receiver is connected.

(4) Consult the dealer or an experienced radio/TV

technician for help.

4. This device must not be co-located or operated in

conjunction with any other antenna or transmitter.

cochlear implants, hearing aids, etc. If you use any

of these medical devices, consult their manufacturer

about the use restrictions of the device.

17. Keep the device at least 15cm away from the

implanted medical device such as pacemaker,

cochlear implants etc.

18. Use of unauthorized or incompatible power supplies,

chargers or batteries may cause ﬁre, explosion or

other hazards.

Informational Note for Customers

in EU Only:

This device has been manufactured by or on behalf of

Shenzhen Grandsun Electronics Co., Ltd. Hereby,

Shenzhen Grandsun Electronics Co., Ltd. declares that

this device is in compliance with Directive 2014/53/EU.

This symbol on the device, the battery or on

the packaging indicates that the device and

the battery shall not be treated as household

waste. By ensuring these devices and

batteries are disposed of correctly, you will

help prevent potentially negative

consequences for the environment and

human health which could otherwise be caused by

inappropriate waste handling. The recycling of the

materials will help to conserve natural resources. In

case of devices that for safety, performance or data

integrity reasons require a permanent connection

with an incorporated battery, this battery should be

replaced by qualiﬁed service staﬀ only. To ensure that

the battery and the electrical and electronic device

will be treated properly, hand over these devices at

end-of-life to the applicable collection point for the

recycling of electrical and electronic device. Hand the

battery over to the applicable collection point for the

recycling of waste batteries. For more detailed

information about recycling of this device or battery,

please contact your local Civic Oﬃce, your household

waste disposal service or the dealer.

This symbol is only valid in the European Union.

1. The Bluetooth® word mark and logos are registered

trademarks owned by Bluetooth SIG. Inc. And any use

of such marks by Shenzhen Grandsun Electronics

Co., Ltd. is under license.

2. Qualcomm aptX is a product of Qualcomm

Technologies International, Ltd. Qualcomm is a

trademark of Qualcomm Incorporated, registered in

the United States and other countries, used with

permission. aptX is a trademark of Qualcomm

Technologies International, Ltd., registered in the

United States and other countries, used with permission.

Trademarks

Being Charged

Red light off: Battery Lever 100%

Red light always on: Being Charged

Not being charged

Open / Close the top cover of the

charging case

Flash white quickly: Battery power

is more than 30%

Flash red quickly: Battery power is

less than 30%

Touch function

Charging Case LED Behavior

Functions Operations

Press twice/Put on

Press twice/Remove

Press and hold 2s

Press twice

Press once

Press twice

Operations

Press twice/Put on

Press twice/Remove

Press and hold 2s

Music

Play

Call

Volume

Voice

Pause

Previous song

Next song

Pick/Hang up call

Reject call

Volume+

Volume-

Activate voice

assistant Press twice and the second press hold for 2s

Left earbud Right earbud

Before using and operating the device, read and

follow the precautions below to ensure that the

equipment performs optimally and avoids

dangerous or illegal conditions

Voice Prompts

1. Power on: “Power on”

2. Enter pairing mode: “Looking for the device”

3. Pairing timeout: “Device not found”

4. Paring successful: “Beep”

5. Paring failure: “Beep”

6. Low battery: “Battery low” （≤10%）

7. Noise cancellation on: “Noise cancellation on”

8. Ambient on：“Ambient on”

9. Noise cancellation, Ambient mode are off: “off ”

10. Sound Max / Min：“Beep””

11. Power off: “Power off”

LED Behavior

Earbud LED Behavior

Flash white quickly: Power on but

not connected with any device

Flash white slowly: Power on and

connected with device

Flash red and white quickly:

Pairing mode

Flash red slowly: Battery low

when connected with device

Flash red quickly and slowly:

Charging (the power is less than 30%)

Flash red slowly: Charging (the

power is more than 30%)

LED off: Battery fully charged

Flash red quickly: Battery low

when not connected with any device

Specifications

Model: 233621® Zen

Driver: 10mm neodymium dynamic driver

Audio CODEC support: SBC, AAC, aptX

Frequency response range: 20 - 20,000Hz

Connections: USB-C cable for case charging

Battery charging: A 10-minute charge delivers up to

1-hour playback; less than 2 hours for a full charge

(when charging unit via USB-C cable and charging case)

Playback time: Up to 10 hours, total 22 hours with

charging case

Support: BT 5.0, A2DP v1.3, AVRCP v1.6, HFP v1.7, HSP v1.2

Bluetooth transmission frequency range: 2.402-2.480GHz

Bluetooth transmission power: <8.0dBm

Battery parameters: Single earbud: 3.7V, 85mAh

Charging case: 3.7V,500mAh

Water resistance rating: IPX4 (for earbuds only)

Weight: 6.6g (single earbud),53.6g (both earbuds

and case)

Regulatory Information

Informational Note for Customers

in U.S.A. Only: Product service policy

2. Keep the volume within the allowable range to avoid

hearing damage. Prolonged exposure to high volume

might result in permanent hearing damage.

3. Exposure to high volume while driving may distract

attention and cause an accident.

4. Do not cover, seal or put other items on the device.

5. Keep the device away from heat sources or bare ﬁre

like electric heaters, microwave ovens, stoves, water

heaters, candles or any place with high

temperature conditions.

6. Do not use an external heating appliance such as a

hair dryer or microwave to dry the device.

7. Avoid striking the device and its accessories to a hard

object or vice versa as it may lead the battery to

explode or might cause malfunction.

8. Wipe the device with a clean, dry, soft cloth. Do Not

use the device before cleaning and maintenance.

9. Use and store the device and its accessories in the

temperature range of 5°~35°. When the environmental

temperature is too high or too low, it may cause device

malfunction. The battery efﬁciency would be limited

when the temperature is lower than 5°.

10. Keep the device and its accessories in a ventilated

and cool environment without exposing it to direct sunlight.

11. This device is not a toy and children may use this

device under adult supervision. This device and its

accessories may contain small parts that should

keep away from children. Children may inadvertently

damage the device and its accessories, or swallow

small parts resulting in suffocation or other hazards.

12. The device is equipped with non-removable built-in

rechargeable battery. Do Not replace the battery by

yourself. The battery can only be replaced by

authorized service center.

13. Do not disassemble or modify the device and

accessories without permission, otherwise the device

and accessories will not be covered under warranty,

please contact the authorized service center when

the device malfunction is detected.

14. Do not dispose this device and its accessories as

ordinary household waste. Comply with the local

laws and regulations dealing with this device and its

accessories and support recycling.

15. In medical and health care facilities where the use of

wireless devices is prohibited, comply with the

regulations of such facilities and turn off the device.

16. Radio waves generated by devices may affect the

normal operation of implantable medical devices or

personal medical devices, such as pacemakers,

1. Do not use this device in dusty, humid, dirty

environment or places near magnetic ﬁeld to avoid

malfunction of the internal circuit of the device.

3. “233621” word mark and logos are registered

trademarks of Shenzhen Grandsun Electronics

Co., Ltd. Reproduction in whole or in part without

written permission is prohibited. Other companies

and products mentioned herein are trademarks of

their respective owners.

Made in China.

1. The device warranty period is 12 months from the

date of purchase. Repair and maintenance service

are free during the warranty period, excluding

malfunctions are man-made.

2. The limited warranty shall not apply to:

a. man-made damage;

b. exceed the warranty period;

c. no warranty card and valid invoice (except those

can prove the product is under the warranty period);

d. the warranty card is altered or not complied with

the device itself;

e. the SN label on device is torn off (except those can

provide warranty card and efﬁciency invoice);

f. accessories damage due to improper use

and maintenance;

g. disassemble or amend the device without

manufacturer authority or water and smashing damages;

h. damages due to force majeure.

3. Service Information

233621 Website:www.233621.com

1. You are cautioned that any changes or modiﬁcations

not expressly approved in this manual could void your

authority to operate this device.

2. This device complies with Part 15 of the FCC Rules.

Operation is subject to the following two conditions:

(1) this device may not cause harmful interference

(2) this device must accept any interference received,

including interference that may cause undesired operation.

3. This device has been tested and found to comply with

the limits for a Class B digital device, pursuant to part

15 of the FCC Rules. These limits are designed to

provide reasonable protection against harmful

interference in a residential installation. This device

generates, uses and can radiate radio frequency

energy and, if not installed and used in accordance

with the instructions, may cause harmful interference

to radio communications. However, there is no

guarantee that interference will not occur in a

particular installation. If this device does cause

harmful interference to radio or television reception,

which can be determined by turning the device off

and on, the user is encouraged to try to correct the

interference by one or more of the following measures:

(1) Reorient or relocate the receiving antenna.

(2) Increase the separation between the device

and receiver.

(3) Connect the device into an outlet on a circuit

different from that to which the receiver is connected.

(4) Consult the dealer or an experienced radio/TV

technician for help.

4. This device must not be co-located or operated in

conjunction with any other antenna or transmitter.

cochlear implants, hearing aids, etc. If you use any

of these medical devices, consult their manufacturer

about the use restrictions of the device.

17. Keep the device at least 15cm away from the

implanted medical device such as pacemaker,

cochlear implants etc.

18. Use of unauthorized or incompatible power supplies,

chargers or batteries may cause ﬁre, explosion or

other hazards.

Informational Note for Customers

in EU Only:

This device has been manufactured by or on behalf of

Shenzhen Grandsun Electronics Co., Ltd. Hereby,

Shenzhen Grandsun Electronics Co., Ltd. declares that

this device is in compliance with Directive 2014/53/EU.

This symbol on the device, the battery or on

the packaging indicates that the device and

the battery shall not be treated as household

waste. By ensuring these devices and

batteries are disposed of correctly, you will

help prevent potentially negative

consequences for the environment and

human health which could otherwise be caused by

inappropriate waste handling. The recycling of the

materials will help to conserve natural resources. In

case of devices that for safety, performance or data

integrity reasons require a permanent connection

with an incorporated battery, this battery should be

replaced by qualiﬁed service staﬀ only. To ensure that

the battery and the electrical and electronic device

will be treated properly, hand over these devices at

end-of-life to the applicable collection point for the

recycling of electrical and electronic device. Hand the

battery over to the applicable collection point for the

recycling of waste batteries. For more detailed

information about recycling of this device or battery,

please contact your local Civic Oﬃce, your household

waste disposal service or the dealer.

This symbol is only valid in the European Union.

1. The Bluetooth® word mark and logos are registered

trademarks owned by Bluetooth SIG. Inc. And any use

of such marks by Shenzhen Grandsun Electronics

Co., Ltd. is under license.

2. Qualcomm aptX is a product of Qualcomm

Technologies International, Ltd. Qualcomm is a

trademark of Qualcomm Incorporated, registered in

the United States and other countries, used with

permission. aptX is a trademark of Qualcomm

Technologies International, Ltd., registered in the

United States and other countries, used with permission.

Trademarks

Noise Cancellation Mode and

Ambient Modes

Cycle through Noise

Cancellation Mode ON,

Ambient Mode ON and

ALL OFF

Noise Cancellation Mode: Our noise canceling technology

and optimized passive isolation can suppress wide-band

ambient noise

Ambient Mode: Allows you to hear sounds around you

even while wearing the earbuds

Press thrice X3

QUICK

START

GUIDE

ZEN

Charging cable

USB-C to USB-A

Ear tips

Touch pad

Earbuds LED indicator

Charging case LED indicator

USB-C Connector

Earphone

Charging Case

Packing List

Product Illustration

User Guide

Choose your ear tips

Use the touch pad

Turn On/Turn Off

Pairing

Ear tips (S/M/L X2)

Do not plug the earbuds into your ears without installing ear

tips, as this may damage your ears

Use touch pad to control Music volume / Play / Pause,

Pick/Hang up /Reject call, Noise Cancellation on / off,

Ambient on / off, and activate the Mobile phone's System

voice assistant for conversation

Turn On: Take out two earbuds or any one earbud from

the charging box.

Turn Off: Put the earbuds back into the charging box.

*To avoid hurting your ears, please do not apply excessive

pressure on the touch pad with your ﬁngers (touch pad lightly)

*To avoid damaging the touch pad, please do not click on it

with any sharp objects

*If the mobile device is not connected in 5 minutes, the earbuds

will enter standby mode, you can follow step 2 to re-pair.

* The earbuds are set to Noise Cancellation Mode when powered ON

After putting the earbuds back into the charging case

and then taking out, the earbuds will automatically

connect to a recently connected mobile phone.

1. Pair and connect for the first time

Wear demonstration

After putting the earbuds into the ear, rotate and adjust

the earbud to the right depth and angle to ﬁt the ear

canal (as shown below)

The size M ear tips are attached to the earbuds in-box.

2. Bluetooth remote disconnection and reconnect

3. Turn on to reconnect

①Remove both earbuds from the charging case;

②Put both earbuds into Bluetooth pairing mode;

③Press and hold the touch pad until the LEDs on the

earbuds flash red 3 times;

④Return the earbuds to the charging case and leave

them there for 10 seconds;

⑤The pairing record is now cleared.

* After clearing the pairing record of the earbuds, the

earbuds will enter the pairing mode directly.

4. To clear the pairing record of the earbuds

①Take out the earbuds from the charging case;

②The LEDs on the earbuds flash red and white alternately,

and the earbuds enter pairing mode;

x3 > 00:02

④After a few seconds, a Bluetooth pairing request pop-up

window will appear, press “Pair” to connect the

second earbud;

⑤Enjoy your Zen

③ Find "233621® Zen" on the Bluetooth list to pair the

ﬁrst earbud;

Bluetooth

233621® Zen

Bluetooth

233621® Zen pair

①If the earbuds are disconnected with the mobile

phone and return to the effective connection range

within 10 minutes, Bluetooth will automatically reconnect.

②If the earbuds are disconnected with the mobile

phone and return to the effective range after 10

minutes, Bluetooth needs to be reconnected manually.

Rotate and adjust to 45° angle position

* For the earbuds that are not paired for the ﬁrst time, when

connecting a new mobile phone, you need to touch the pad for any

earbud 3 times in a row, and the third press holding for 2 seconds,

the LEDs flash red and white alternately.

IMPORTANT!

The operation of switches on your hi-ﬁ system may

cause clicks which at high volume settings may aﬀect

your hearing. Therefore, always set the volume

control to minimum before switching between

diﬀerent sources.

WARNING!

. To guarantee your personal safety, please ensure that

these earbuds are not worn kept in the immediate

vicinity (close than 15 cm) of a pacemaker.

· Do not insert jack plug into electric sockets.

· Supervise children when using the device, the product

is not a toy.

· Earbuds listening at high volume levels particularly

over extended periods of time may damage your hearing.

Table of contents

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