Usage: To electrically connect the main vehicle to your additional vehicle, the towing electrical signal connector of the main vehicle must be mated with the towing electrical signal connector of the additional vehicle. If the electrical signal plugs of your main vehicle and additional vehicle do not match, then this 13-pin to 7-pin converter can perfectly solve your problem. Trailer Power Signal Cable: The 13-pin male to 7-pin female trailer adapter is a standard European plug. Create a secure connection between your main vehicle and your additional trailer. Transmits the vehicle's electronic signal lights to the trailer. Waterproof Cover: The 7-pin female socket has a waterproof cover to better protect the electrical socket when the towing adapter is not in use. Increases the adapter's lifespan. The waterproof cap is spring-loaded, which protects the connector from wind and rain more quickly. The high-quality plastic housing prevents rust. Application: Suitable for European standard