Epos ADAPT 660 BT ANC Headset is a double-sided Bluetooth headset w/ BTD800 UC Dongle. The best-in-class, noise-cancelling microphones and Active Noice Cancellation (ANC). Has multi-connectivity to switch between softphone and mobile calls. Dedicated button for Microsoft Teams via BTD 800 USB dongle. Tap and hold to activate Alexa and stay on top of your day-to-day business. Never miss a meeting and make scheduling easy. Up to 30 hours (ANC on, Bluetooth off). High end design with soft leatherette ear pads for all-day comfort.