Compatible with laptops, Bluetooth phone, tablets and mobile phones. Four "beam-forming" microphones allow for boomless design. Two additional mics for Active Noise Cancellation (ANC) helps you hear. Smart sensors answer calls by simply putting the 8200 UC headset on. 20 hours of talk-time easily gets you through the busiest of days. Dynamic Mute Alert informs you when you try to talk when muted. Binaural stereo speakers provide hi-fi sounds of amazing quality. Plantronics