Your camper/RV has lights built in to it that you cannot turn on unless you are plugged in to your truck. LITESWICH allows you to use the power and lights already in your camper to allow 360 ground vision around your camper. Be the envy of your campground - Light up your camper/RV with LITESWICH! Have you been to a campground and seen a camper or RV with all of their exterior running / marker / parking lights on - but the camper wasn't plugged in to a truck? They probably had a LITESWICH! WHY spend hundreds of dollars on exterior lighting and customization of your campers/RV. LITESWICH lets you turn on the exterior lights of your camper that normally only turn on when the camper is plugged in to your truck. Your camper doesn't come with the ability to turn these lights on you need LITESWICH to do it! --Foolproof connection - uses the 7 pin wiring connection you normally plug in to your truck. --Will ONLY work with campers that have a 7 pin connection. --After you set up your camper just plug in the LITESWICH, flip the power switch and on come your marker/clearance and taillights lights. --Uses the 12v power from your camper (uses the battery if not plugged into shore power) to power the lights. LITESWICH is a patented product of campers just like you (US Patent number 9,375,987). Ships from Wisconsin.