FEATURES 1. UHF PLL32/64Channels wireless tour guide system/monitor system. 2. Noise locked &pilot tone locked.2xAA batteries, standing time about 8hours. 3. Special charging hole. Up to 40-60 meter operation distance in perfect environment. SPECIFICATION Transmitter (WMS-1T) Receiver(WMS-1R) Frequency Range: 500~980MHz Frequency: 500-980MHz Frequency Stability: 0.0005% AF output voltage adjusting knob Transmitter power output: 10MW(H),5MW(L) Frequency response: 50Hz-15KHz+/-3db AF gain adjusting: -20db to +35db AF output change: earphone/line output Frequency response: 50Hz-15KHz+/-3db Operating distance: 40-60M