The TowSmart 7-Blade to 6 Round and 5/4-Wire Flat Trailer Light Wiring Adapter is the quickest and easiest way to make electrical connections when hauling a trailer that has a different wiring configuration than the vehicle. This adapter is ideal for tow vehicles equipped with a 7-blade connector to be able to tow a trailer equipped with a 4/5-Wire Flat or 6-pin connection with a center pin auxiliary. The adapter provides power for taillights, brake lights, and turn signals on the 4-Wire Flat. When using the 5-Wire Flat side of the adapter, the reverse circuit is activated. The 6-pin connector adds a 12-Volt auxiliary power circuit and an electric trailer brake function. The single housing design plugs into your vehicle's electrical socket and requires no wiring. It provides an ergonomic, durable plastic construction that is corrosion-resistant to withstand extreme weather.