Description: mute control: noise-locking frequency deviation: about 18KHZ freqency response: 50HZ-13KHZ freqency steadiness: about 0.005% S/N Ratio: more than 70DBM Total harmonic distortion: 0.5%(1K) Channel: two channels Sensitvity: -80DBM Max effective range: 100 m in the open area Receiver power supply: DC12V/300MA Transmitter power supply: 9V tier battery Transmitter power: 20MW Frequency range: 220MHZ-270MHZ Output Type: Independent balance output & Single mixture output