Infrared wireless discussion video chairman unit, features latest numerical control design. With elongated microphone bar for choice. Wounded capacitive pickup head, equipped with replaceable windscreen. LCD display with black field, red or black letter. Large LCD display shows signal strength, battery power, charge status, power status, microphone switch state, microphone ID number, the system's control channel number and the corresponding operating instructions dynamic buttons. Microphone head with a lamp ring that shows the state of the microphone. Unrestricted by limiting function, nor participate in the rotation mode. Systems can only equipped with one chairman the ID number is 001. With priority function that can compulsory cut off the speech of the microphone. With chairman special mode.