Heinrich's MC1/DC1 is a chairman/delegate unit designed for use with the CE2500A intelligent conference host. This unit features a microphone, speaking button, and indicator lamp, allowing users to control and indicate their speech status. It is equipped with a single projection microphone with anti-gas, sonic boom, and wind shield features. The unit includes a president priority key, enabling the system sound to be set to terminate or suspend microphone status for all speakers. The chairman unit can be placed in any position in the loop and is unrestricted by the limiting function. It also features an under-wound capacitive microphone pole and speak halo instructions, ensuring high sensitivity and clear communication. The power for the delegate units is supplied by the master controller at a safe 24-volt voltage. The unit connects via a T-shaped 8-core line and includes a microphone unit connecting cable. It complies with International Electrical Equipment Certification standards (IEC 60914) and the International Safety Standard UL or CE Certification. Additionally, the microphone unit includes built-in speakers (speaker unit) and has a headphones listening function. The receiver is equipped with a circular glow lamp ring, displaying the microphone to speaker, and features a noiseless light touch switch.