The CS3 CU chairman unit is a microphone station with two operating modes. In priority call mode, the user can manually mute all connected delegate stations. In next in line mode the CS3 CU automatically activates the next delegate station in the waiting list. The station provides a built in speaker and 2 x 3.5 mm stereo jacks to connect headphones for up to two delegates. The CS3 CU comes with a robust interface connector, which makes it easy to interchange the stations microphone. The detachable microphone comes in two choices - the CS321 cardioid condenser capsule on a 30 cm long gooseneck and the 50 cm long CS521.