2-channel VHF system: Professional and Intelligent Dual Wireless Microphone System,uses the VHF 220-270 MHz segment,avoid the interference frequency.;Unique and scientific design: Individual front-panel volume controls and audio mute circuitry, provides noiseless on/off switching.;Ideal for professional use at any events: Karaoke, sound source recording and amplifying, vocal concerts, live-performances, conference, musical and opera, church, school, hall, family, party, etc.;The wide use ranger: Distance 150 meter,open and spacious ideal usage distance 100 meter.;Equipped with professional receiver: The channel of the transmitter and receiver can easily synchronize.