Power Injector Switch Plate - WhiteThe Wall Mount Power Injector is a convenient way to switch between your cable feed and over-the-air signals from your JACK antenna.To use the Power Injector, simply turn the unit on with the ON/OFF button. When on (button depressed), the power light will turn green indicating volts to the antenna, and the over-the-air signal from your JACK antenna will be fedto the two TV outputs. When off, the cable TV signal will be fed to the two TV outputs if wired for cable TV input.