Three-way connectivity. Enterprise-grade DECT audio allows you to roam or multi-task up to 180 m from your PC. One-touch controls – such as call answer/end, volume up/down and mute – let you manage calls from any connected device within roaming range. Convenient voice prompts notify you of mute status, roaming range limit, and more. Noise-cancelling microphone. Flexible microphone boom. 13 hours of talk time. Built for UC applications and soft phones from Avaya, Cisco, Skype and others.USB-A connection for PC, mobile and deskphone. Sold by each. Black.