Mute control:noise-locking Frequency response:50hz-13khz Stability: ía0.005% S/n ratio:>70dbm T.H.D.:05%(1k) Channel:two Sensitivity:-80dbm Working range:100m Receiver power supply:dc 12v/300ma Microphone pwer:9v Output power:20mw Frequency range:220mhz-270mhz Output:single mix output