Multi-Function Design - This dual-output vehicle end trailer wiring adapter converts any 4-way flat, vehicle-end plug to a combination 7-way outlet and 4-pole flat outlet, making it easy to tow different trailers with your vehicle Weather Resistant - This trailer wire connector comes with protective cover for 4 pin and 7 pin socket to keep the terminals clean when not in use. The wiring harness is also well-protected with the included split loom Prewired for Easier Installation - The Trailer wiring harness plugs into existing 4-way flat connector and hardwires to existing wiring to get additional functions needed for 7-way (some splicing required) Standard Connection - This trailer wiring adapter's 4 Way flat output connects tail lights, brake lights, and turn signals, 7-Way connects tail, brake, reverse, turn signals, and auxiliary power Easy and Cost Effective - Provide all the needed electrical and mounting hardware connector kit to provide BOTH the 4 and 7 wire plug in for your trailer Distance between bracket mounting holes center to center: 2-1/4inch Harness length: 10inch Yellow wire is for reverse lights Blue wire is for brakes Black wire is for 12 volt power White wire is ground colour:Black Material:ABS plastic Package Contents: 1 x RV Wiring Adapter Only the above package content, other products are not included. Note: Light shooting 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.