The MCS-D 3823 chairman microphone unit is equipped with a microphone, priority and clear button and a two-way loudspeaker system. The microphone button is used for normal switching on and off of the microphone. The chairman is not governed by the maximum number of open microphones. With the priority button, the chairman can join the discussion and switch the active delegate microphone units to mute. The clear button switches off all of the activated delegate microphone units. If the LED on the microphone button is lit, this signals that the microphone is ready to be used. A noticeable feature of the integrated loudspeaker is its accurate and intelligible sound. If the participant switches on their microphone, their own loudspeaker is switched off to improve the gain before feedback. The Revoluto microphone array technology with integrated microphone capsules provides a so-called corridor characteristic which ensures a wide range of good voice quality. The speaker can move freely, i.e. can stand up or sit down, can move his/her head and move towards or away from the microphone unit. Power is supplied to the microphone unit via the bus cable. As part of the MCS-Digital conference system, the microphone system can be employed at any position in the bus network.