OBO PRO.2 u_puretone SYN3 User manual

22-Dec-2020 Initial draft 1.0
Copyright OBO PRO.2 All rights reserved.
u_puretone
Quick Start Guide
Hearing-Through and Low-Latency Technology
True Wireless Stereo Earbuds
2020/12/18

22-Dec-2020 Initial draft 1.0
Copyright OBO PRO.2 All rights reserved.
PACKAGE CONTENTS
2 x SYN3 True Wireless Stereo Earbuds (L/R)
1 x SYN3 Charging Case
1 x USB Type-C Charging Cable
6 x Ear Tips ( S/ M/ L )
1 x User Manual (Quick Start Guide)
PRODUCT DIAGRAM
A. Main Function Touch-Key
B. Microphone
C. Charging Contacts (Earbuds)
D. Ear Tip
E. USB-C Charging Port
F. Function Button
G. Display LED
H. Charging Contacts (Charging Case)
I . Product laser marking
A
B
B

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C
D
E
G
F
H
I

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Product laser marking

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EARBUD TECH SPECS
Earbud –SYN3 Tech Specs
Size & Weight
Approx. 4.5 g x 2
32 x 22 x 24 mm
Material of shell
PC/ABS
Ear tip: Silicon
Speaker Driver Unit
Dimeter: 11mm , Micro speaker x 1
Impedance: 16 Ω±15% ohm at 3KHz
SPL: 118±2dB @1mW (0.126Vrms) 1KHz.
THD: <1% @100-10KHz 1mW (0.126Vrms)
Type : Dynamic, LSR
Range: 20Hz~15KHz
Microphone
MEMS x 2
Range: 100Hz ~ 10KHz
Battery Life
Charge Time : 1Hr 40min
Play Time : 5Hr (with audio streaming)
Storage Time : 23°C , 4 weeks
Battery Capacity : 60mAh / 3.7V
Hearing-Through Support
Yes.
Low Latency Support
Yes
Button type
Touch Key x 1
In-Ear detection
Yes
Waterproof level
IPX4
Working Temperature
-5°C ~ +45°C
In charging status: 0°C ~ +45°C
Digital Audio Codec
24bits stereo
Sample Rate : up to 96KHz
Bluetooth® Specification
BLUETOOTH® Version 5.0 EDR+LE
Distance: Straight line 30ft (10m)
Frequency Range : 2.4GHz (2.4000GHz-2.4800GHz)
Profile: A2DP 1.3, AVRCP 1.6, HFP 1.7, HSP 1.2
SUPPORTED AUDIO FORMAT(S) : SBC, AAC

22-Dec-2020 Initial draft 1.0
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CHARGING CASE TECH SPECS
Charging Case –SYN3 Tech Specs
Size & Weight
Approx. 35 g
66 x 42 x 30 mm
Battery Life
Charge Time : 1Hr 30min
Charge Earbuds : Approx. 3 cycles
Battery Capacity : 500mAh / 3.7V
Button type
TACT switch x 1
Pairing, clean device list, factory default
Charger Input
USB Type C Connector
DC 5V/1A input

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OPERATION AND FUNCTION
Function
Operation
Voice Prompt
Special Functions
HT mode ON
Tap the touch control of the right earbud and hold for 5 seconds.
HT on
HT mode OFF
Tap the touch control of the right earbud and hold for 5 seconds.
HT off
Gaming mode ON
Tap the touch control of the left earbud and hold for 3 seconds.
Gaming on
Gaming mode OFF
Tap the touch control of the left earbud and hold for 3 seconds.
Gaming off
Voice Assistant
Tap the touch control of the earbud and hold for 2 seconds.
/
MUSIC Playing
Play music
Tap the touch control of the earbud twice.
/
Pause music
Tap the touch control of the earbud twice.
/
Forward Track
Tap the touch control of the left earbud three times.
/
Backward Track
Tap the touch control of the right earbud three times.
/
Other
Reset status
Place both earbuds into the charging case, and closed the top cover.
Then reopen the top cover.
Power off
BT Pairing
Pairing mode
Opened the top cover of charging case, when the earbuds in charging
mode, then press and hold the button for 3 seconds
Pairing
Phone Call
Answer the Call
Tap the touch control of the earbud twice.
/
Hang up the call
Tap the touch control of the earbud twice.
/
Call rejected
Tap the touch control of the earbud and hold for 2 seconds.
/
Functions
Power ON
Opened the top cover, when the earbuds in charging mode. The earbuds
will power on automatically.
Power on
Power OFF
Place both earbuds in the charging case, then closed the top cover. The
earbuds will power off automatically.
Power off
Charging Case Battery
Capacity Display
Opened the top cover of the charging case and press the button once.
/
Earbuds Battery Capacity
Display
Display on your smartphone by APPs.
/

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CHARGING DEVICE
Charge the earbuds
Please follow the right direction to put the earbuds into the left and right position of
the charging case, and closed the cover.
PS: Please note that when the Earbud’s battery is too low, that will have a voice for low
battery prompt, earbuds will be shut down the system then power off after a voice
prompt if it continues used when without charge.
Charge the charging case
Please connect the charging port using the Type-C charging cable with the USB
charging adaptor according to specification 5V/1A or connect the USB port output of the PC
computer. The charging case is charging when the LED (RED/YELLOW/GREEN) is blinking, and
full battery when the green LED always on.
PS: Please note that when the battery of the charging case is too low, that will have a red
LED blinks warning and the charging case will power off automatically, if it continues used
when without charge.
CHARGING CASE LED DISPLAY
Top cover of the charging case
When you want to open the top cover on the charging case, please hold the left or right
side of the LED on the charging case, and unfold the top cover by your thumb and index
finger of the other hand. And this is a magnetic design of the charging case top cover.
Display Battery Capacity of the Charging Case
The LED will display the battery capacity of the charging case, when open the top cover
and press the button of the charging case.
BATTERY CAPACITY OF THE CHARGING CASE
LED DISPLAY
1
Battery < 30%
RED
2
30% > Battery > 90%
YELLOW
3
90% > Battery >100%
GREEN

22-Dec-2020 Initial draft 1.0
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BLUETOOTH EARBUDS SIMPLE PAIRING
1. Follow the right direction to put the earbuds into the left and right position of the
charging case, and closed the cover.
2. Open the top cover and press the button of the charging case for 3 seconds.
3. Took out the earbuds from the charging case and put the earbuds into the ears according
to the position of L (left ear) and R (right ear).
4. Open the Bluetooth setting on your smartphone and searching for the Bluetooth device of
「SYN3」.
5. Select「SYN3」and connected.
6. Hearing the voice prompt of pairing success、connected from earbuds, if connected
correctly.
PS: Please follow repeat step1 to step5, if connecting fail. The pairing list of the earbuds
can storage 8 devices maximum.
CLEANING DEVICE LIST
1. Place both earbuds in the charging case, and close the top cover.
2. Open the Bluetooth setting on your smartphone and select 「Forget This Device」.
3. Open the charging case, then press the button and hold for 10 seconds.
HOW TO WEAR
Please put the earbuds into the ear according to the position of L (left ear) and R (right ear)
and rotate the earbuds to the vertical direction and adjust it to a comfortable position.
PRIMARY & SECONDARY EARBUDS SWITCHING
The earbuds will display「SYN3」on your Bluetooth device when it was pairing. The
secondary Earbud will replace with the primary Earbud automatically when the primary
Earbud’s battery is too low and auto power off or disconnected.
The secondary Earbud will repeat the step as mentioned above when
your earbuds connected and put the primary Earbud into the charging
case. The primary Earbud would continue and not influenced by the
secondary Earbud if you put the secondary Earbud into the charging case.

22-Dec-2020 Initial draft 1.0
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TROUBLESHOOTING
Please follow the action step by step, when your earbuds can not connect
successfully with your smartphone nor had only one side on sounded:
1. Place both earbuds in the charging case, and close the top cover.
2. Open the Bluetooth setting on your smartphone and select 「Forget This Device」.
3. Turn off your Bluetooth device and restart again on your smartphone.
4. Opened the top cover of the charging case and press the button on the charging case for 10
seconds to reset the earbuds setting.
5. Open the Bluetooth setting on your smartphone and searching for the device named
「SYN3」and tap “connect”then accept the connection to finish when it appears on the
screen.
APP MANUAL

22-Dec-2020 Initial draft 1.0
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HEARING SAFETY
Please do not use the d evice at the ma ximum volume for a lon g time, to
avoid damage to your hearin g.
When driving a veh icle, do not wear binaural earbuds to avoid distracted
driving and cau se traffi c accidents.
If you need to answer a call by the device when you're driving a vehicle,
please follow the relev ant regulations of th e l ocal national laws.
IMPORTANT INSTRUCTIONS
FCC (Federal Communication Commission Interference)
FCC ID: 2A2G4-SYN3
1. 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.
2. Changes or modifications not expressly approved by the party responsible for
compliance could void the user's authority to operate the equipment.
NOTE: This equipment 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 equipment 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 equipment does cause
harmful interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
Reorient or relocate the receiving antenna. Increase the separation between the
equipment and receiver. Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected. Consult the dealer or an experienced
radio/TV technician for help.

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FCC Radiation Exposur e Statement
The device has been evaluated to meet general RF exposure requirement. The
device can be used in portable exposure condition without restriction.
CE (Conformité Européenne Interference)
客戶名稱 declares that the radio equipment type [Bluetooth earbuds SYN3] is in
compliance with Directive 2014/53/EU. The full text of the EU declaration of conformity is
available at the following internet address: www.optoma.com
Notice: This device may be used in each member state in EU.
CAUTION RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE. DISPOSE OF USED
BATTERIES ACCORDING TO THE INSTRUCTIONS.
NCC (National Communications Commission)
Administrative Regulations on Low Power Radio Waves Radiated Devices warning:
Article 12 Without permission granted by the NCC, any company, enterprise, or user
is not allowed to change frequency, enhance transmitting power or alter original
characteristic as well as performance to an approved low power radio-frequency
devices.
Article 14 The low power radio-frequency devices shall not influence aircraft security
and interfere legal communications; If found, the user shall cease operating
immediately until no interference is achieved.
The said legal communications means radio communications is operated in
compliance with the Telecommunications Act.
The low power radio-frequency devices must be susceptible with the interference
from legal communications or ISM radio wave radiated devices.