With this transmitter you can send signal from cameras or other AV devices at distance up to 150 meters within direct line of sight. You can attach to it video and two audio channels. With the switches at rear end of the transmitter you can adjust its output frequency to any one of the standard channels: CH1 - 2.414GHz, CH2 - 2.432GHz, CH3 - 2.483GHz, CH4 - 2.468GHz. Powered by adapter. Operating voltage from 9 to 12 V.