UM-3 32/64 channels tour guide system wireless mic

UM-3 wireless tour guide system (Mono) TRANSMITTER(UM-3T) Operating frequency :500-980MHz Frequency stability:0.005% Transmitter power output:10mw(H),5mw(L) AF gain adjusting-20dB to +35dB Frequency response:50Hz-15KHz ±3dB Power supply :2 * AA batteries ,standing time :about 8 hours Special charging hole with ACT(IR)function RECEIVER(UM-3R) Operating frequency :500-980MHz AF output voltage adjusting knob Frequency response:50Hz-15KHz ±3dB AF output change: earphone/line output Noise locked +pilot tone locked Power supply :2 * AA batteries ,standing time :about 8 hours Special charging hole with ACT(IR)function distance :60-100meters