A. Wide application: This trailer wire adapter plug can power the trailer lights. By connecting the trailer plug to the vehicle socket, one can turn on the taillights, brake lights, and turn signals. B. Brass terminals: This trailer wire connector plug uses brass terminals, which have good electrical conductivity. The ABS housing is not prone to damage. C. 7 - pin to 4 - pin: This trailer adapter plug is suitable for many trailers, cars, and vehicles equipped with a 7 - pin European circular plug to a 4 - pin American flat socket. D. Easy installation: This round - to - flat trailer adapter adopts a plug - and - play design, which is relatively simple to install, saving time and effort. E. Secure connection: This 7 - pin to 4 - pin trailer adapter provides a stable and reliable connection and is easy to use. F. Item type: Trailer wire adapter plug G. Conversion type: 7 - pin European to 4 - pin American H. Application scenarios: Trailers, tractors, RVs I. Color: Black J. Material: ABS + copper K. Package contents: 1 trailer wire adapter plug. Only the above package contents are included, no other products. L. Note: Light reflection and different monitors may cause some slight differences between the color of the item in the picture and the actual object. A measurement tolerance of +/- 1 - 3 cm is allowed.