1、Power Supply for Trailer Lights: Connects trailer plug to vehicle socket to activate tail lights, brake lights, and turn signals. Provides a convenient and reliable power source for trailer lights. 2、Durability: Trailer adapter plug with heavy duty silver metal connector structure, durable shell, and brass terminals for excellent conductivity. 3、Secure Connection: Connector easily inserts into trailer's existing socket and securely locks in place, with no play or loose parts. 4、Coiled Wire: Spring wire design allows for extended flex length up to two meters, making it suitable for most environments. 5、Easy Installation: Simply plug and play design with no cutting or splicing required. Suitable for trailers, caravans, boats, and RVs.