1. Wide Application: This trailer wire adapter plug supplies power to the trailer lights. Connect the trailer plug and the vehicle socket to turn on the tail lights, brake lights, and turn lights 2. Brass Terminals: This trailer wiring connector plug features brass terminals for excellent electrical conductivity. ABS housing is not easy to damage. 3. 7 Pin to 4 Pin: This trailer adapter plug is suitable for most trailers, cars and vehicles with 7 pin European round plug to 4 pin American flat socket. 4. Easy Installation: This round to flat trailer adapter adopts plug and play design, easy to install, time saving and effort saving. 5. Secure Connection: This 7 pin to 4 pin trailer adapter provides secure and reliable connection, easy to use. Item Type: Trailer Wire Adapter Plug Conversion Type: 7 Pin European to 4 Pin American Application: Trailer, Towing Truck, RV Colour:Black Material:ABS+copper Package Contents: 1 x Trailer Wire Adapter Plug Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.