features VHF 210-280MHz, high signal/noise ratio performance offers stable signal transmit and clear sound quality. Features: VHF 210-280MHz band microphone system to avert frequency interface. High signal/noise ratio performance, stable signal transmit, clear and high power sound. Dual frequency design, independent volume adjust knob for channel A and channel B. The effective working range up to 40 meters in the open area. With RF signal and AF signal LED indicators.