COPPER POWER CORD: The 7-way trailer cord is made of high-quality copper and has a long service life. And has excellent electrical and thermal conductivity, to ensure the normal use of car lights in the process of driving (such as turn signal and brake lights, etc.) JUNCTION BOX: The junction box is equipped with 7 color-coded terminals and wires, which can easily identify the corresponding functions of the wires and facilitate wiring. Strong junction boxes are waterproof and dust resistant to increase the service life of trailer cords BREAKAWAY SWITCH: This 12 V trailer breakaway switch provides safer traction by connecting the trailer's breakaway battery and trailer brake. If the trailer is disconnected while being towed, the cable will release and the brakes will be activated DOUBLE PRONG TRAILER PLUG: The CheeMuii 7 pin trailer plug uses the premium copper double prong to replace the poor single prong, and the outer wrap is made of weatherproof and durable material to ensure a longer service life DETAILED WIRING INSTRUCTION: CheeMuii trailer cords use 7 color-coded wires, and the color code adopted is suitable for most RV trailer wiring standards, but as there are some differences between trailer manufacturers, we have updated the detailed instructions, please read them carefully before use. Please refer to the wiring instructions and connect cables according to the color and function of the wires to avoid errors WIDE APPLIATION: Suitable for trailers, RVs, campers, caravans, food vans and other towed vehicles. Perfectly connected taillights, brake lights, reverse lights, turn signals and auxiliary power CheeMuii 12 FT 7 Way Trailer Wiring Harness Kit with 12V Breakaway Switch Heavy Duty 7 Way Trailer Cord with 7 Pin Trailer Plug and 7 Gang Trailer Junction Box 【COPPER POWER CORD】- The 7 way trailer wire is made of high-quality copper and has a long service life. And has excellent electrical and thermal conductivity, to ensure the normal use of car lights in the process of driving (such as turn signal and brake lights, etc.) 【BREAKAWAY SWITCH】- This 12 V trailer breakaway switch provides safer traction by connecting the trailer's breakaway battery and trailer brake. If the trailer is disconnected while being towed, the cable will release and the brakes will be activated 【DOUBLE PRONG TRAILER PLUG】- The CheeMuii 7 pin trailer plug uses the premium copper double prong to replace the poor single prong, and the outer wrap is made of weatherproof and durable material to ensure a longer service life 【JUNCTION BOX】- The junction box is equipped with 7 color-coded terminals and wires, which can easily identify the corresponding functions of the cables and facilitate wiring. Strong junction boxes are waterproof and dust resistant to increase the service life of trailer cords 【DETAILED WIRING INSTRUCTION】- CheeMuii trailer cords use 7 color-coded wires, and the color code adopted is suitable for most RV trailer wiring standards, but as there are some differences between trailer manufacturers, we have updated the detailed instructions, please read them carefully before use. Please refer to the wiring instructions and connect cables according to the color and function of the wires to avoid errors 【WIDE APPLICATION】- Suitable for trailers, RVs, campers, caravans, food vans and other towed vehicles. Perfectly connected taillights, brake lights, reverse lights, turn signals and auxiliary power