Mst-100a chair unit

·LED indicating speech mode, working status, low voltage indication, chairman control button and other content information.

· The external communication antenna 

· The microphone has a light ring to display the speech status.

· It has the priority and exclusive function of speaking, and has the permission to forcibly cut off speaking on behalf of the unit.

· Power Supply: DC 4.5V, AA1.5V*3

· Transmit power: 10mW

· Microphone head: capacitive, single pointing

· Microphone Sensitivity: -47±2dB@1KHz

· Frequency response: 30-18khz