Key benefits Engineered waterproof design to withstand adverse weather conditions, ensuring reliable operation when towing or using trailer lights outdoors Waterproof cover protects connections, enhancing safety and reducing exposure to moisture during use Facilitates connecting a trailer to a power supply for displaying trailer signal lights, simplifying installation and operation European car 3hole plug connector provides stable lowvoltage 12V use, supporting reliable trailer lighting What it is and how it works Function: a waterproof connection solution that links trailer wiring to the vehicle power source to power and display trailer signal lights Compatibility: designed for European 3hole plug connectors and 12V electrical systems Performance: built to endure typical outdoor conditions with a weatherresistant design and protective cover Use scenarios Tow a trailer in rainy or snowy weather: the waterproof design and cover protect the connection, allowing safe and reliable trailer light operation Outdoor events, camping, or parking with external power: connect trailer lights to a separate power supply while keeping connections protected from moisture European vehicle setups requiring a 12V trailer lighting connection: stable 12V performance through the European 3hole plug, ensuring consistent signal light display Note: this description preserves the original device purpose and specifications, focusing on function, compatibility, and practical applications without adding details.