- Digital hybrid Active noise cancelling (ANC) multiple microphones 3 levels of advanced digital hybrid active noise canceling- HD Wideband Stereo sound for phone calls or music- Microphone boom arm that can be worn on either side and maintain location of R/L stereo.- Rotate boom up to mute and down to unmute- Compatible with all major VoIP apps from Avaya Cisco IBM Skype and more- Up to 19 hours talk time when fully charged- Class 1 Bluetooth Poly BT700 dongle included- 160 feet of Bluetooth range from PC- Super light weight - only 175g (or 0.38lbs)- Dynamic Mute alert senses and tells you when talking while muted- Smart sensors knows when the headset is on or off; user can be easily answered by simply putting on the headset; pause music for incoming calls or mute a call by taking the headset off- Controls on the headset allowing answer/end calls volume control and mute; track forward/back for music playback- Online busy indicator on ear pad lets others know when you are on a call- Plush Leatherette ear cushions- Storage carrying case included