Sennheiser PRESENCE UC ML Headphone Over-the-ear Headset Wireless Bluetooth Active Sound Cancellation, Bluetooth Headset for Mobile Communications and PC, Wireless and Optimized for Microsoft Lync, Compatible with all softphone applications, HD Sound, 3 Channel Microphones noise, Automatic call transfer, Voice alerts, battery status icon on iPhone, Wireless range: 25 m. Headphones: Intraaural, Headphone frequency: 100 to 15000 Hz, Battery recharge time: 1.33 h.
