* Each system has three-way serial output, Can connect up to 180 microphone units
* Can limit the number of microphones while working, Optional modes1/3/6.
* Audio output / input
* Microphone light touch switch
* High-fidelity capacitor microphone,Red led
* The leadership units speak free, and can control the other units to speak
*Input power :24V (CPU)
* Output socket:8P
* Input wire:2.1M8P Shielded wire