The TowSmart Electrical Adapter is the quickest and easiest way to make electrical connections when hauling a trailer that has a different wiring configuration than the vehicle. The single housing design plugs in your vehicles electrical socket and requires no wiring. This adapter is ideal for trailers that require a 4-way flat connection but have a 7-way blade towing vehicle. The adapter connects tail lights, brake lights, turn signals and reverse lights. It provides an ergonomic, durable plastic construction that is corrosion resistant to withstand harsh weather conditions. Offers a built in LED light tester to ensure all functions are properly equipped.