Monaural unified communications Bluetooth headset for a softphone and mobile phone/smartphone Connection to a softphone via the BTD 800 USB dongle Ultra-noise-cancelling microphone filters background noise HD sound for a clear and natural audio experience Large leatherette ear pad for a perfect fit and all-day wearing comfort ActiveGard technology protects you from sudden sound surges Technology: Bluetooth 4.0 Talk time: up to 15 hours (HD audio) Charge time: 2.5 hours Range: up to 25 m Includes: USB charging stand, BTD 800 USB dongle Optimised for Skype for Business