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 crystal-clear conversations 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 time: up to 10 days Charge time: approx. 2 hours Weight: 7.9 g Includes: USB dongle, USB cable, car charging adapter, storage case, 2 sizes of ear hooks, 4 EarGels, quick start guide Optimised for Skype for Business