1. INTRODUCTION:This 7pin trailer wiring harness extension cable uses highquality copper core and highstrength plastic connector. It can be connected simultaneously to trailer tail lights, reversing lights, brake lights, turn signals, electric trailer brakes and auxiliary equipment power cords. 2. COMPATIBLE MODELS:Please refer to the details page below for detailed applicable vehicle models. 3. MATERIAL:This trailer extension harness uses highquality copper core with good electrical conductivity, highquality rubberwrapped material, anticorrosion and antioxidation, and connectors made of highstrength engineering plastic for durability. 4. INSTALLATION:This 7pin trailer wiring harness does not require you to perform complicated operations such as cutting and reconnecting the original wiring harness. You simply change the position of the plug to complete the installation, and it's long enough to accommodate your placement preferences. (21/8inch Hole Saw Required for Installation)