Spracht Zum ECO-DECT Pro - UC ECO-Dect 6.0/USB Wireless Low-emission Headset + Base Station with up to 500 feet of Wireless Range ECO-DECT technology for lower emissions - Dynamic Power adjustment for lowest level of emissions based on distance from Base Station|Seucre Wireless Range up to 500 feet - long battery life|Connect via RJ11/headset jack or via USB to computer (Lync/Skype/VOIP compliant)|Use over the head headband or ear hook - Active DSP noise cancellation microphone - Full Duplex for simultaneous conversations|Conference call with up to three callers - Phone calls can be answered and ended remotely with Lifter