The on-ear Bluetooth headset with BTD 800 USB dongle helps you stay agile. Four ANC microphones reduces distracting background noise The ear padding additionally reduces noise The foldable microphone boom and two advanced microphones optimise speech capture and ensure clarity. Charging time: approx. 3 hours 40 minutes Battery running time: Up to 46 hours listening time (ANC switched off) Up to 41 hours talk time (ANC switched on) Includes: BTD 800 USB dongle, USB-C cable and transportation case Certified for Alcatel Lucent, Avaya, Cisco Jabber, Cisco Webex, Mitel, Google Voice, Google Meet, Microsoft Teams, Zoom