Audio-Technica ATW-2120AI 2000 Series Wireless Handheld Microphone System Serious advances in affordable professional wireless Clear sound quality and rock-solid, dependable performance Automatic frequency scanning 10 compatible user-switchable channels in one of two UHF frequency ranges Includes ATW-R2100a receiver and ATW-T220a handheld cardioid dynamic microphone/transmitter I Band Frequency: 487.125-506.500 MHz (TV 16-20)