1. Extended microphone for medium and large conferences 2. Just insert the extension microphone into the bottom of the CC4000E speaker phone, the microphone can be automatically identified and configured 3. The mute button on the microphone allows you to easily remotely control the entire speaker phone system from the other end of the table. 4. When the microphone is muted, the call is in progress, and the Bluetooth wireless pairing starts, the indicator will show 5. Interface: USB3.0
