1. Oloa Ua Ovaview
The EPOS Adapt 661 is a premium Bluetooth headset designed for maximizing focus and productivity in various environments. It features adaptive Active Noise Cancellation (ANC), superb call clarity powered by EPOS AI™, and stereo sound. The headset is optimized for Unified Communications (UC) and certified for Microsoft Teams, ensuring seamless integration with professional communication platforms. It includes a BTD 800 USB-C dongle for PC connectivity.

Ata: Luma view of the EPOS Adapt 661 Headset, showcasing its sleek black design and over-ear cups.
2. Mea i totonu o le afifi
Fa'amautinoa o lo'o iai mea uma i totonu o le afifi:
- Headset EPOS Adapt 661
- BTD 800 USB-C Dongle
- USB Totogi Uaea
- Audio Cable (3.5 mm jack)
- Tauave Pusa
- Taiala Saogalemu
- Pepa o le Tausisia o Tulafono

Image: Contents of the EPOS Adapt 661 package, including the headset, USB-C dongle, USB cable, carry case, safety guide, and compliance sheet.
3. Seti
3.1. Totogiina le Headset
- Connect the supplied USB charging cable to the USB-C port on the headset.
- Connect the other end of the USB cable to a powered USB port (e.g., computer, wall adapter).
- O le fa'ailoilo LED i luga o le headset o le a fa'aalia ai le tulaga o le fa'atumuina. E tusa ma le 3 itula le umi e fa'atumu atoa ai.
3.2. Malosi i luga/Pepe
- To power on: Press and hold the Power button until the LED illuminates.
- To power off: Press and hold the Power button until the LED turns off.
3.3. Feso'ota'iga i Masini
3.3.1. Bluetooth Pairing (Mobile Device)
- Ia mautinoa o loʻo faʻaola le ulu.
- Activate Bluetooth pairing mode on the headset (refer to the specific button combination in the safety guide, typically holding the Bluetooth button). The LED will flash blue/red.
- On your mobile device, go to Bluetooth settings and select "EPOS Adapt 661" from the list of available devices.
- Once connected, the LED will turn solid blue.
3.3.2. Connecting to PC (BTD 800 USB-C Dongle)
- Plug the BTD 800 USB-C dongle into an available USB-C port on your PC.
- The dongle will automatically pair with the headset. The LED on the dongle will turn solid blue when connected.
- Ensure the EPOS Adapt 661 is selected as the audio input and output device in your PC's sound settings.
- For Microsoft Teams certification features, ensure Microsoft Teams is running on your PC.
4. Fa'atonuga o Galuega
4.1. Pulea Autu
- Pulea le Volume: Use the touch panel on the right earcup (swipe up/down) or physical buttons (if present) to adjust volume.
- Ta'alo/Taofi: Tap the center of the right earcup.
- Su'e Skip: Swipe forward/backward on the right earcup.
- Pulea Valaau:
- Answer/End Call: Tap the center of the right earcup.
- Reject Call: Press and hold the center of the right earcup.
- Fesoasoani Leo: Press the dedicated voice assistant button (if present) or tap and hold the center of the right earcup to activate your device's voice assistant (e.g., Alexa, Siri, Google Assistant).
4.2. Fa'ate'aina le Pisa (ANC)
The Adapt 661 features adaptive ANC, which automatically adjusts noise reduction based on your environment. You can typically toggle ANC on/off or adjust its intensity using a dedicated button on the headset or through the EPOS Connect app.
4.3. TalkThrough Function
The TalkThrough feature allows you to hear your surroundings without removing the headset. Activate this function via a dedicated button or the EPOS Connect app to temporarily reduce audio volume and amplify ambient sounds.
4.4. Feso'ota'iga a le Microsoft Teams
When connected to a PC via the BTD 800 USB-C dongle, the headset offers seamless Microsoft Teams integration. A dedicated button on the headset can launch Microsoft Teams on your PC, answer/end Teams calls, and mute/unmute the microphone within Teams.
5. Key Features Explained

Image: EPOS Adapt 661 Headset highlighting key features such as superb call clarity, adaptive ANC, and superior sound.
- EPOS AI™ Powered Call Clarity: Machine learning algorithms optimize voice pickup from three advanced microphones, ensuring a natural listening experience for your callers.
- Adaptive Active Pisa Faalēaogā (ANC): A 4-microphone system continuously monitors your environment, adjusting noise reduction for optimal focus indoors and minimizing wind noise outdoors.
- Leo Stereo Sili: Enjoy high-quality audio for both communication and music, enhanced by a personalized audio profile to aid concentration.
- UC Certified Solution: Certified for Microsoft Teams and optimized for various Unified Communications platforms, guaranteeing clear and reliable calls.
- Feso'ota'iga fa'atele: Connect simultaneously to two Bluetooth devices (e.g., mobile phone and PC via dongle), allowing seamless switching between audio sources.
- Alexa Integration: Built-in Alexa voice assistant for hands-free control and organization.

Image: The EPOS Adapt 661 Headset with "Optimized for UC" text, displaying logos for Microsoft Teams, Webex, Avaya, and Alcatel-Lucent Enterprise, indicating broad compatibility.
6. Tausiga
- Fa'amamaina: Use a soft, dry cloth to clean the headset. Do not use liquid cleaners or solvents.
- Teuina: When not in use, store the headset in its provided carry case to protect it from dust and damage.
- Tausiga maa: To prolong battery life, avoid fully discharging the battery frequently. Charge the headset regularly.
- Tempera: Avoid exposing the headset to extreme temperatures (below -4°F / -20°C or above 140°F / 60°C).
7. Faʻafitauli
7.1. No Sound or Poor Audio Quality
- Siaki Volume: Ensure the headset volume and device volume are turned up.
- Toe fa'alua: Disconnect and re-pair the headset with your device.
- Filifiliga Meafaigaluega: On your PC, ensure "EPOS Adapt 661" is selected as the default playback and recording device.
- Totogi maa: A low battery can affect performance. Ensure the headset is charged.
7.2. Headset Not Connecting
- Malosiaga: Ensure the headset is powered on and in pairing mode (if applicable).
- Ua ola le Bluetooth: Fa'amaonia ua mafai le Bluetooth i lau masini.
- Mamao: Ensure the headset is within the Bluetooth range (up to 82 feet / 25 meters line of sight).
- Fa'alavelave: Alu ese mai isi masini uaealesi e ono fa'alavelave.
- So'oga Dongle: If using the BTD 800 dongle, ensure it is securely plugged into the PC.
7.3. Active Noise Cancellation (ANC) Not Effective
- Fa'atatau talafeagai: Ensure the earcups form a good seal around your ears. Adjust the headband for a snug fit.
- ANC i luga: Verify that ANC is activated.
- Siosiomaga: Adaptive ANC adjusts to different noise types; some irregular or sudden noises may not be fully cancelled.
8. Fa'amatalaga Fa'apitoa
| Igoa Fa'ata'ita'iga | FAATATAU 661 |
| Numera o Mataupu | 1001004 |
| La'ei Siila | I'uga o le ulu, taliga i luga |
| Lanu | Lanu uliuli |
| Feso'ota'i | Bluetooth 5.0, Wired (3.5 mm Jack, USB-C) |
| Uaealesi tulaga | Up to 82 feet (25 meters) line of sight |
| Fa'aleaogaina Pisa | ANC fetuutuunai |
| Microphone | EPOS AI™ optimized voice pickup |
| Taimi Totogi | Pe tusa. 3 itula |
| Taimi Tumau | E oʻo atu ile 360 itula |
| Galulue Vevela | 32°F - 104°F (0°C - 40°C) |
| Teuga vevela | -4°F - 140°F (-20°C - 60°C) |
| Mamafa Ulutala | 8 aunese (227 kalama) |
| Vaaiga (Oloa) | 8.2 x 7.4 x 2.6 inisi (20.8 x 18.8 x 6.6 cm) |
| Tusipasi | Microsoft Teams, aptX, Made for iPhone (MFI) |
| Fa'apitoa Fa'apitoa | ActiveGard, WindSafe, TalkThrough, Room Experience, SpeakFocus, Mobile App Support, Advanced Own-Voice, Multimedia & Music Listening, Touch Control, Voice Prompts |
9. Fa'amaonia ma Lagolago
The EPOS Adapt 661 Headset is covered by a manufacturer's warranty. For detailed warranty information, please refer to the compliance sheet included in your package or visit the official EPOS website. For technical support, troubleshooting assistance beyond this manual, or to inquire about replacement parts, please contact EPOS customer service through their official support channels.
Punaoa i luga ole laiga:
- Official EPOS Webnofoaga: www.liga-leo.com
- Product Support Page: (Refer to official website for specific product support page)





