Professional wireless Microphone is the hot sale product in the whole world marketing and owns good honor and feedback, BK-701, which has good quality and  beautiful look. VHF frequency has two independent audio output, no interference and noise . The microphone is designed to fit the human touch feeling, it will make you feel comfortable when you touch it Frequency Range: VHF 210-290 MHz Transistor Modulation Mode: FM; Squelch Control: Noise Lock Frequency Deviation: +/-18kHz; Frequency Stability: +/- 5khz Frequency Response: 50Hz-17kHz Dynamic Range: > 90dB; F/N Ratio: > 90dB Receiving Power: 220V/50Hz; S/N Ratio: 70 dB Total Harmonic Distortion: -85dBFrequency Range: VHF 210-290 MHz Transistor Modulation Mode: FM; Squelch Control: Noise Lock Frequency Deviation: +/-18kHz; Frequency Stability: +/- 5khz Frequency Response: 50Hz-17kHz Dynamic Range: > 90dB; F/N Ratio: > 90dB Receiving Power: 220V/50Hz; S/N Ratio: 70 dB Total Harmonic Distortion: -85dB