Converts Your Car's 13-Pin Socket: This trailer socket adapter converts your car's 13-pin socket into a 7-pin socket. Durable Design: Environmentally friendly nylon housing, environmental protection prevents rust and lasts a long time. Thanks to the waterproof protective cap and spring, the trailer socket is suitable for all weather conditions and can remain permanently on the vehicle. Easy Installation: Simply plug this small 13-pin adapter into the socket, then plug your standard 7-pin plug into the other side. After pushing the adapter halfway into the socket, turn it 90 degrees (1/4 turn clockwise) to secure it. Suitable for European standard trailers: This 13- to 7-pin plug is suitable for European standard trailers. It can supply power to your caravan, trailer, and truck. Establish a stable and secure connection between your carrier vehicle and the towing vehicle and transmit electronic light signals to the vicinity of the trailer.