Feature 1, Converts the 4Pin socket on your car to the 7pin female socket. 2, Simple plug-and-play design reduce the trouble of cutting or splicing. 3, Widely applicable for standard American car modification, trailer socket converter. 4, Safe and dependable performance, reasonable design. 5, Contact point of pure copper, good conductivity, surface plating, better corrosion resistance.Features: Converts the 4Pin socket on your car to the 7pin female socket. Simple plug-and-play design reduce the trouble of cutting or splicing. Widely applicable for standard American car modification, trailer socket converter. Safe and dependable performance, reasonable design. Contact point of pure copper, good conductivity, surface plating, better corrosion resistance. Specification: Material: Plastic + Brass Color: Black Input: 12V Pin: 4Pin to 7Pin Package Weight: approx. 439g/15.5oz Application: can be used for trailers, caravans and so on Wiring Configuration: PIN 1 - White Wire (Connect to Vehicle Frame for Ground) PIN 2 - Blue Wire (Connect to Output Wire on Brake Controller) PIN 3 - Yellow Wire (Spare Wire for 12V Power, Reverse Light for Trailer Brakes) PIN 4 - Black Wire (Connect to Battery with Fuse or Breaker for 12V Power Source) Package list: 1 * 4Pin to 7Pin Trailer Connector 1 * 4 Wire Flat Female Adapter Plug 1 * Mounting Bracket with all Necessary Hardware Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.