Optimised for Microsoft Lync Monaural unified-communications Bluetooth headset for PC / notebook and mobile phone / smartphone Noise cancelling dual microphones reduce background noise Smartphone voice-activated control button HD Voice for crystalclear voice quality Bluetooth 4.0 technology Range: 10 m when connected to mobile phone or smartphone, 30 m when connected to PC or notebook with USB dongle Talk time: up to 6 hours Standby: up to 10 days Charge time: approx. 2 hours Weight: 7.9 g Package contents: USB dongle, USB cable, auto charging adapter, storage case, quick reference guide