White amplified wall plate with on/off switch and indicator light. Uses 12V DC. The switch plate has an amplified circuit and 3 ports in the back and one cable port up front as well as the 12VDC (cigarette lighter) outlet. When you push the button (LED is lit) the roof antenna signal is boosted and the TV receives that signal. When you push the button to turn off the LED, it allows the TV to receive the campground cable signal.