Sennheiser EPOS ADAPT 660 User manual

User Guide
ADAPT 660
Over-ear Bluetooth®headset with ANC

ADAPT 660 Bluetooth®headset
Contents1
Contents
The ADAPT 660 headset......................................................................................................................................................................................2
Package contents.......................................................................................................................................................................................................3
Product overview........................................................................................................................................................................................................4
Overview of the headset........................................................................................................................................................................................................................................4
Overview of the dongle ..........................................................................................................................................................................................................................................7
Overview of the icons...............................................................................................................................................................................................................................................7
Getting started .............................................................................................................................................................................................................8
Pairing the headset with Bluetooth®devices.......................................................................................................................................................................................8
Using the audio cable ...........................................................................................................................................................................................................................................10
Using the USB cable...............................................................................................................................................................................................................................................10
Installing the Smart Control app.....................................................................................................................................................................................................................11
Installing the EPOS Connect software......................................................................................................................................................................................................11
Changing Audio settings for the headset – Microsoft®Windows .....................................................................................................................................11
Using the headset....................................................................................................................................................................................................12
Turning the headset on and connecting it...........................................................................................................................................................................................12
Turning Bluetooth on / o ..................................................................................................................................................................................................................................12
Turning the headset o.........................................................................................................................................................................................................................................12
Adjusting and wearing the headset............................................................................................................................................................................................................13
Adjusting the volume ..............................................................................................................................................................................................................................................13
Adjusting the headset’s microphone volume for softphones...............................................................................................................................................13
Muting the microphone........................................................................................................................................................................................................................................14
Using Active Noise Cancellation (ANC)...................................................................................................................................................................................................14
Turning TalkThrough on / o............................................................................................................................................................................................................................ 15
Making calls using the headset .....................................................................................................................................................................16
Making a call.................................................................................................................................................................................................................................................................. 16
Accepting / rejecting / ending a call....................................................................................................................................................................................................... 16
Redialing ...........................................................................................................................................................................................................................................................................17
Using the voice assistant / Alexa / voice dial.....................................................................................................................................................................................18
Managing multiple calls........................................................................................................................................................................................................................................ 19
Using headset and dongle with Microsoft®Teams / Cortana................................................................................................ 20
Invoking Microsoft®Teams and check notications...................................................................................................................................................................20
Activating and using Microsoft®Cortana.............................................................................................................................................................................................20
Listening to audio using the headset.........................................................................................................................................................21
Additional functions...............................................................................................................................................................................................22
Charging the headset battery....................................................................................................................................................................................................................... 22
Verifying remaining battery power............................................................................................................................................................................................................. 23
Activating / deactivating the Smart pause function................................................................................................................................................................... 23
Changing the sound eect...............................................................................................................................................................................................................................24
Activating / deactivating Call Enhancement......................................................................................................................................................................................24
Adjusting the Sidetone.........................................................................................................................................................................................................................................24
Enabling / disabling voice prompts, tones and changing language ............................................................................................................................. 25
Reconnecting / disconnecting Bluetooth via the dongle..................................................................................................................................................... 25
If you leave the Bluetooth range................................................................................................................................................................................................................. 26
Storing and transporting the headset.................................................................................................................................................................................................... 26
Maintaining the products and updating the rmware................................................................................................................... 27
Cleaning the products..........................................................................................................................................................................................................................................27
Replacing the ear pads........................................................................................................................................................................................................................................27
Updating the rmware of the products................................................................................................................................................................................................. 28
Replacing / removing the headset‘s rechargeable battery.................................................................................................................................................. 28
If a problem occurs ...............................................................................................................................................................................................29
Clearing the pairing list of the headset (Reset) ............................................................................................................................................................................ 30
Clearing the pairing list of the dongle (Reset)............................................................................................................................................................................... 30
Specications.............................................................................................................................................................................................................. 31

ADAPT 660 Bluetooth®headset
The ADAPT 660 headset2
The ADAPT 660 headset
Maximize focus and productivity anywhere with the ultimate headset powered by EPOS AI™ for crystal clear calls,
adaptive ANC and superior stereo sound. Enjoy a unique UC optimized solution with machine learning enhanced
microphone performance.
Adaptive ANC helps you regain concentration by monitoring your working environment and adjusts noise reduction
accordingly; even reducing wind noise when outdoors.
Get straight into collaborative work via a dedicated button that launches Microsoft Teams on your PC via the dongle
included. Stay organized with Alexa voice assistant and connect simultaneously to mobile and PC.
Whether revitalizing your open office, working on-the-go, or enjoying a relaxed commute with superior stereo sound,
ADAPT 600 boosts efficiency and improves wellbeing; an essential audio tool for today’s mobile workforce.
Key benets & features
Superb call clarity powered by EPOS AI™
Machine learning developed algorithms optimize
voice pick up, for a natural listening experience
from three advanced microphones
Regain concentration anytime, anywhere
Four adaptive ANC microphone system monitors
your working environment and adjusts noise
reduction in open offices, while reducing wind
noise outdoors
Get organized with Alexa
Tap and hold to activate Alexa and stay on
top of your day-to-day business. Never miss a
meeting and plan your schedule both in and out
of the office
Ensure clear calls with UC certified solution
Certified for Microsoft Teams and optimized for UC
Experience superior sound to increase your
focus
Renowned stereo sound and a personalized audio
profile means you can enjoy high-quality music to
help your focus on work
!
§
§
For safety instructions, consult the Safety Guide.
i
A list of accessories can be found on the product page at www.eposaudio.com.
Trademarks
The Bluetooth®word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Sennheiser Communications A/S is
under license.
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.
All other trademarks are the property of their respective owners.

ADAPT 660 Bluetooth®headset
Package contents3
Package contents
ADAPT 660
Bluetooth headset
Case
BTD 800 USB or BTD 800 USB-C
Bluetooth dongle
USB cable
with USB-A and micro-USB plug
Audio cable
with 2.5 mm and 3.5 mm jack plug
Quick Guide on the box
Safety Guide
Compliance sheet

ADAPT 660 Bluetooth®headset
Product overview4
Product overview
Overview of the headset
Headband
ANC switch
Microphone
LEDs
Teams/Pairing button
Audio socket
USB socket
ANC Microphones
Touch pad
Bluetooth switch
Overview of the headset LED indications
• Headset connected
• Headset turned o
3x
• Headset turns on
• Bluetooth device found
• Incoming call
3x
• Headset turns o
• Headset disconnected from mobile device/dongle
• Incoming call (rechargeable battery is weak)
Headset in pairing mode:
searching for mobile device/dongle
Rechargeable battery is weak
Battery power between 2 and 20%
Battery power between 21 and 40%
Battery power between 41 and 60%
Battery power between 61 and 80%
Battery power between 81 and 100%
*Once the headset is successfully connected, the LED goes o.

ADAPT 660 Bluetooth®headset
Product overview5
Overview of the headset controls
Ear cups Page
Turns the headset on
12
Turns the headset off
Touch pad Tap Function Page
Accepts a call 16
2 calls: Answers incoming & ends active call 19
Starts / pauses media playback 21
2x
Turns TalkThrough on/off (ANC turned on) 15
Puts an active call on hold (pause) / unholds call 16
2 calls: Answers incoming & puts active on hold 19
2 calls: Toggles between two calls 19
1s
Rejects a call 17
Ends a call 16
2 calls: Ends active & unholds paused call 19
2s Activates voice assistant
18
Activates Alexa
4s Requests remaining battery power 23
Swipe Function Page
Mutes the microphone 14
• Skips to the previous track
• Swipe and hold: Rewinds the track* 21
Unmutes the microphone 14
Swipe and hold: Redials the last number 17
• Skips to the next track
• Swipe and hold: Fast-forwards the track* 21
Increases the volume
13
Decreases the volume
* These functions are not supported by all connected Bluetooth devices.

ADAPT 660 Bluetooth®headset
Product overview6
Bluetooth switch Press Function Page
Turns Bluetooth on
12
Turns Bluetooth off
Teams/Pairing button Press Function Page
Initiates a call 16
Invokes Microsoft Teams 20
Cancels pairing (Pairing mode) 8
2x Launches Smart Control app* 11
1s Activates Cortana 18
4s Pairs the headset with a Bluetooth device 8
Clears pairing list (Pairing mode) 30
* These functions are not supported by all connected Bluetooth devices.
ANC switch Press Function Page
Turns ANC Maximum mode on
14
Turns ANC Adaptive mode on;
adjustable via the Smart Control App
Turns ANC off

ADAPT 660 Bluetooth®headset
Product overview7
Overview of the dongle
BTD 800 USB BTD 800 USB-C
USB-A plug
Link LED
Link button
USB-C plug
Link LED
Link button
Overview of the dongle LED indications
3x
3x
Dongle in pairing mode:
searching for headset
3x
3x
Pairing successful
3x
3x
Pairing failed
3x
3x
Dongle tries to connect to a Bluetooth device
3x
3x
Dongle and Bluetooth device connected
3x
3x
Incoming call
3x
3x
• Outgoing/active call
• Media playback
3x
3x
Connected to Teams
3x
3x
• Teams notication
• Connecting to Teams or Invoking Cortana
3x
3x
Microphone of the connected Bluetooth device is muted
Overview of the dongle button
Link button Press Function Page
3s Pairs the dongle with the headset 8
Reconnects the headset 25
2x Disconnects the headset 25
Overview of the icons
Tap the button iNotes: Good to know
2x Press the button twice LED indications
3s Press and hold the button Voice prompt is announced

ADAPT 660 Bluetooth®headset
Getting started8
Getting started
Pairing the headset with Bluetooth®devices
!
CAUTION
Danger of malfunction!
The transmitted radio waves of mobile devices can impair the operation of sensitive and unprotected devices.
XOnly use Bluetooth where it is permitted.
The headset complies with the Bluetooth 5.0 standard. Bluetooth devices need to support the “Hands-Free Prole” (HFP),
the “Headset Prole” (HSP), “Audio Video Remote Control Prole” (AVRCP) or the “Advanced Audio Distribution Prole”
(A2DP).
To transmit data via Bluetooth, you rst have to pair your
headset to a wireless device. The delivered dongle is already
paired with the headset.
The headset can save up to eight paired devices. If you pair
the headset with a ninth device, the device with the oldest
activity in the pairing list will be overwritten. If you want to
re-establish a connection with this device, you have to pair
it again.
The headset can be connected to two of the paired devices
at the same time. You can only connect another device by
disconnecting one of the already connected devices.
Connecting the headset via the dongle
USB-A
USB-C
To connect the headset wirelessly with a computer, use the
BTD 800 USB or BTD 800 USB-C dongle.
The dongle and the headset in the bundles are already
paired.
XTurn the headset on (see page 12).
XPlug the dongle into the USB port of your computer.
The dongle LED flashes blue while searching and switches
to dimmed blue when connected successfully to the
headset.
If Microsoft Teams is invoked: The dongle connects to
Teams and lights up purple instead of blue.
The dongle shows Teams notifications (see page 20).
i
To manually pair the headset and the dongle, activate the pairing mode for both:
XPress and hold the headset’s Power button and the dongle’s button until the LEDs alternately ashes blue
and red. Once the dongle and the headset are connected, the dongle lights up dimmed blue.

ADAPT 660 Bluetooth®headset
Getting started9
Pairing the headset via Bluetooth with a mobile device
1
3x
2
XTwist the ear cups to turn on the headset. XSwitch to position "I" to activate Bluetooth.
4s
34
XPress and hold the Teams/Pairing button until the LEDs
lights up white one after the other.
The headset is in pairing mode.
XEnable Bluetooth on your mobile device and start the
search for Bluetooth devices – see instruction manual of
your mobile device.
...
...
EPOS ADAPT 660
...
5
< 20 cm
6
3x
XSelect “EPOS ADAPT 660” to establish a Bluetooth
connection to the headset.
One LED flashes 3 times white as soon as the headset
finds a device to connect to. The LEDs turn off.
i
To cancel pairing:
XPress the Teams/Pairing button.

ADAPT 660 Bluetooth®headset
Getting started10
Using the audio cable
Use the audio cable for media playback when the battery is low or when Bluetooth transmission is restricted or not allowed.
Bluetooth immediately turns o once the audio cable is connected to the headset.
XInsert the small jack plug into the audio socket of the
headset.
Bluetooth is deactivated.
XConnect the 3.5 mm jack plug to the audio output of
your mobile device.
To disconnect the audio cable:
XPull the plug out of the headset and your mobile device.
The headset automatically tries to connect to available
paired Bluetooth devices.
i
You can use the Active Noise Cancellation (ANC) as usual (see page 14).
Using the USB cable
Use the USB cable for calls via softphone or media playback via USB and charging.
EPOS ADAPT 660
XConnect the supplied USB cable to the USB socket of the headset and a USB socket of your computer.
The battery is being charged – see page 22.
XClick the Audio icon on your PC and select EPOS ADAPT 660.

ADAPT 660 Bluetooth®headset
Getting started11
Installing the Smart Control app
Sennheiser
Smart
Control
The free Smart Control app allows you to configure and
update your headset and offers additional settings.
XOpen the App Store or Google Play app on your mobile
device.
XSearch for "Sennheiser Smart Control".
XDownload and install the app.
Installing the EPOS Connect software
www.eposaudio.com/connect
x
EPOS Connect
The free EPOS Connect software allows you to configure
and update your headset and offers additional settings.
XDownload the software from
www.eposaudio.com/connect.
XInstall the software.
You need administrator rights on your computer – if
necessary, contact your IT department.
To make calls via the computer:
XInstall a softphone (VoIP Software) or ask your admin for
support.
Changing Audio settings for the headset – Microsoft®Windows
x
Audio settings
ADAPT
ADAPT
Windows usually changes the Audio settings automatically
if you connect a new headset.
If the headset is connected but you hear no sound:
XRight-click the Audio icon.
XSelect under output ADAPT 660 as speaker.
XSelect under input ADAPT 660 as microphone.

ADAPT 660 Bluetooth®headset
Using the headset12
Using the headset
!
CAUTION
Hearing damage due to high volumes!
Listening at high volume levels for long periods can lead to permanent hearing defects.
XSet the volume to a low level before putting on the headset.
XDo not continuously expose yourself to high volumes.
Turning the headset on and connecting it
3x
3x
XTwist the ear cups to turn on the headset.
One LED flashes 3 times white. The headset
automatically tries to connect to available paired
Bluetooth devices.
One LED flashes 3 times white as soon as the headset
nds a device to connect to. The LEDs turn off.
Turning Bluetooth on / o
XTurn Bluetooth on if you want to use the headset wireless.
Turns Bluetooth on
Turns Bluetooth off
Turning the headset o
3x
XTwist the ear cups to turn o the headset.
One LED flashes 3 times red. All volume settings are
saved automatically when the headset is turned o.
XCharge the headset (see page 22).
OR
XStore the headset (see page 25).

ADAPT 660 Bluetooth®headset
Using the headset13
Adjusting and wearing the headset
For good sound quality and best possible wearing comfort, adjust the headset.
R
L
XPut the headset on so that the headband runs over the
top of your head and the side with the R marking rests
on your right ear.
XAdjust the headset so that
•your ears are comfortably covered by the ear pads,
•you feel even, gentle pressure around your ears,
•a snug t of the headband on the head is ensured.
Adjusting the volume
1
2
3
You can adjust three independent volume settings for the
headset:
1. Call volume: during an active call
2. Audio volume: during audio streaming
3. Volume for ring tone, tones and voice prompts:
in idle mode – no active call or audio streaming
XSwipe up or down to increase or decrease the volume.
Depending on the length of the swipe, you can adjust
the volume in smaller steps (short swipe) or in larger
steps (long swipe).
You hear a double beep when the minimum or maximum
is reached and louder or lower beeps for tones and
voice prompts.
To protect your hearing when you switch the headset
back on, very high volume levels are reset to a moderate
level when switching o.
Alternatively you can adjust the volume on your
connected device.
Adjusting the headset’s microphone volume for softphones
Softphone x
XInitiate a call on your connected device to someone
who will help you nd the correct volume setting for
your microphone.
XChange the microphone volume in your softphone
application and/or in your PC audio application.

ADAPT 660 Bluetooth®headset
Using the headset14
Muting the microphone
XSwipe
•backward to mute or
•forward to unmute the microphone.
You hear a tone.
Using Active Noise Cancellation (ANC)
This headset provides attenuation of ambient noise using Active Noise Cancellation (ANC) technology. Special microphones
optimize speech and reduce background noise.
When "Adaptive ANC" is selected, active noise cancellation depends on the intensity of ambient noise. The active noise
cancellation can be strong if the ambient noise is high, or weak if the ambient noise is low. You can control the extent of
noise cancellation for the ANC Adaptive mode via the Smart Control app.
If you are in a noisy environment but would like to have your own quiet space, you can use the headset itself, disconnected
from any device, and simply benet from ANC. You can activate ANC if the battery is suciently charged and if the headset
is turned on.
Good to know about ANC
•Continuous uniform noise, such as motor or fan noise, is suppressed
•Speech or high-frequency noise is reduced
•If a slight noise in very quiet environments occurs: Deactivate ANC.
•If unusual whistling or beeping noises occur: Take the headset o and put it on again and check the t of the ear cups.

ADAPT 660 Bluetooth®headset
Using the headset15
Turns ANC Maximum mode on
Turns Adaptive ANC mode on;
adjustable via the Smart Control App
Turns ANC off
Adjusting the Adaptive ANC
Noise Cancellation
Adaptive
Adaptive
Smart Control
The Smart Control app allows you to select different ANC
modes that offer the optimal settings depending on the
application/situation.
For example, low-frequency noise can be suppressed, wind
noise can be minimized or a possible feeling of pressure
on the ears can be avoided.
XStart the Smart Control app.
XOpen Noise Cancellation.
XChange the intensity of the Noise Cancellation.
Turning TalkThrough on / o
TalkThrough allows you to communicate with your colleagues without having to remove the headset, even when ANC is
turned on. Media playback will be paused or muted.
2x Activates / deactivates TalkThrough

ADAPT 660 Bluetooth®headset
Making calls using the headset16
Making calls using the headset
The following functions depend on the connected device.
Making a call
Softphone x
XInitiate the call on your connected device.
OR
XPress the Teams/Pairing button to initiate a call via your
softphone.
If your call is not automatically transferred to the headset:
XSearch this function in the instruction manual of your
connected device.
Accepting / rejecting / ending a call
When you receive a call, you hear a ring tone and the LED ashes blue.
3x
Softphone x
Accept / hold a call
Accepts a call
2x Puts an active call on hold (pause)
If Smart Pause is activated (see page23):
XLift the headset from the desk and put it on.
The sensor registers motion and the incoming call is accepted.
XLay down the headset.
The call is put on hold.
XPut the headset on again to resume the call.

ADAPT 660 Bluetooth®headset
Making calls using the headset17
Reject / end a call
1s Rejects a call
1s Ends a call
Redialing
Swipe and hold: Redials the last
number

ADAPT 660 Bluetooth®headset
Making calls using the headset18
Using the voice assistant / Alexa / voice dial
The last connected Bluetooth device will be used for voice assistant or voice dial.
For Microsoft Cortana: see page 20.
Before you can use Amazon Alexa as a voice assistant, you have to add the headset to the Amazon Alexa app – see
below.
2s Activates voice assistant / Alexa /
voice dial
Cancels voice assistant / Alexa /
voice dial
Connecting the headset to Amazon Alexa
Amazon Alexa
Amazon Alexa
Smart Control
XStart the Smart Control app on your mobile device.
XOpen the settings and activate Amazon Alexa for your
ADAPT 660 headset.
XStart the Amazon Alexa app and select Add Device.
XSelect ADAPT 660 from the list of found devices to
connect the headset to Alexa.
i
There are on-screen notifications to guide you
through the settings.

ADAPT 660 Bluetooth®headset
Making calls using the headset19
Managing multiple calls
Softphone x
3x
You can use the Headset with up to two connected
Bluetooth devices.
Two calls can be managed simultaneously.
If you receive a call during an active call, a knock on tone
will be played.
Accept / reject second call
Softphone x
Active call 2nd incoming call
Accepts the incoming call and
ends the active call
2x Accepts the incoming call and
puts the active call on hold
1s Rejects the incoming call and
continues the active call
Toggle between calls / end active call
Softphone x
Active call 2nd held call
2x Toggles between the active and held call
1s Ends the active call and makes the held call active