Unleash Wireless Freedom Don't just sit there! You need to move. Get that cup of coffee while still talking. Answer and end calls while you're away from your desk too, by adding a Remote Handset Lifter or Electronic Hook Switch. Eco-DECT lower emissions as well. You will really appreciate the crystal clear sound and voice quality. The noise canceling microphone screens out the noise around you so you will be heard as well as you can hear. ZuM Maestro DECT 6.0 Binaural Features Wireless range up to 350'. Noise-canceling microphone. Wide-band speaker. The Multi Function button allows you to answer/end calls on the headset or you can dock/undock the headset from the Base Station instead. DECT is a secure protocol compared to Bluetooth. You can use multiple headsets in the same area with- out them interfering with each other. You can have conference calls with up to 4 headsets. Volume Control and Microphone Mute can both be adjusted on the headset.