The Light Buster is a duel fuction, back-up or utility light which plugs directly into any 7 way round RV/trailer receptical.With the Light Buster you can now see behind your vehicle with clarity on the darkest of nights. Use it in back up mode and everytime you put your truck into reverse, 50 watts of bright white light illuminates everthing behind you. Switch to utility mode and you can now do everything from hooking up a trailer to setting up camp with perfect visibility! No Wiring - Just Plug it in!