UHF 740-790MHz frequency band Channels: 100CH (L/R channel is available), Super heterodyne; double frequency; conversion, with high receive sensitivity, Pilot precise, interference resistance, Multi-level high-performance SAW filter, with excellent anti-jamming capability, Auto mute and anti-skip circuit, it completely eliminates the impact of noise when microphone; turn on and turn off, Professional Audio Output: XLR balanced output and 1 / 4 "jack unbalanced output, Using AA; batteries, Double step-up design, the battery charge does not affect the transmission power, Manual frequency-selecting, correspond frequency in infrared ray, automatic searching frequency, High reliability surface mount technology (SMT) production. Product Features: UHF 740-790MHz wave band output level:#160; 0~300mV Frequency Response:50~15KHz(3dB) systematic distortion: 90dB dynamic range: >100dB Operating range: 30~50 meters for KTV / can be expanded to 100 meters for special request.