Monaural headset, Digital MEMS microphone (3 microphones) , Bluetooth connectivity with Dongle, aptX certification, up to 10 hours talk time & up to 336 hours standby, 1.2 hours charge time, 25m Wireless range (line of sight) , Connect to two devices at once. Premium Bluetooth headset for the mobile professionals, who require a consistently excellent communication solution wherever. Optimized for Unified Communications and certified for Skype for Business, including a carry case and USB dongle. Your partners and customers demand that you are always within reach in the office, outside, and even while driving. With ADAPT PRESENCE you can depend on consistently reliable audio that monitors your working environment and delivers excellent sound quality wherever work takes you. 3 best-in-class, noise-cancelling microphones and unique noise filtering technologies benefit both speaker and listener. Talk for longer with up to 10 hours of narrowband and 8 hours of wideband call time between c