User Guide for the VC800 Video Conferencing System12CPE90 Wired Expansion MicThe CPE90 can work as expansion microphone of the CP960 conference phone. It supports360-degree audio pickup at a radius of up to 3 meters. There is a mute button on its top. Youcan mute or unmute the CPE90 by tapping the mute button during a call.Name Description① Built-in Microphones Support 360-degree audio pickup at a radius of up to 3meters.② Mute Button Mutes or unmutes the CPE90. For more information on themute indicator LED, refer to LED Instructions on page 18.For more information on how to use CPE90 Wired Expansion Mic, refer to Using the CPE90Wired Expansion Mic on page 181.