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		MODEL: VHF-303 Receive Channel:4 Channels Frequency Range：210-260MHz Frequency Stability:±0.005% Frequency Response:40Hz-20KHz S/N Ratio:>80dB Dynamic Range:>80dB Total Harmonic Distortion:<0.8% RF Powe Output:Max 20mW Validate The Function Distance:(80-100)m Depending on the circumstance.