Conference system SY-800 microphone, chairman of the function and index of frequency response frequency reference response:40-16000Hz sensitivity Sensitivity:-40 + 2dB pick up the distance between reference sound-receiving distance:20-120cm chairman microphone pronunciation keys control the speech by priority botton microphone on / off first to open the key on / off botton on the microphone function index of microphone frequency response frequency reference response:40-16000Hz sensitivity Sensitivity:-40 + 2dB pick up the distance between reference sound-receiving distance:20-120cm microphone on / off key on / off botton on the microphone