1. Connect Your Wire Harness: 8 ft long trailer cord with 7way copper blade molded heavyduty plug, provides a fast and simplified way for wires connection as well as keeping all your trailer wiring in order. 2. Easy Splicing: 7 Colorcoded wires coated with durable rubberlike insulation for convenient wiring. The colorcoded is suitable for most standard trailer wiring, some may differ due to different trailer manufacturers. 3. Construction and Flexible Connection: Trailer extension cord uses conductive copper wire, soft and rugged PVC housing provides flexibility for you to connect to your car. Also Weatherproof and corrosionresistant for a long lifespan. 4. Versatile Applications: Perfect for connecting tail, brake, reverse, turn signals and auxiliary power of your trailers, RVs, campers, caravans, food vans and other towed vehicles. Please carefully read the diagram before any operations on the product.