CONVENIENT INSTALLATION AND DISASSEMBLY: Enjoy effortless plug-and-play functionality. Easily insert the 7 pin trailer tester plug into your trailer's connector. Then, activate your vehicle's lights and signals and review the status of each LED indicator. No tools or batteries are required. LONG-LASTING CONSTRUCTION: Our 7 pin tester is finished with a sturdy nylon body and high-conductivity copper terminals. It is designed to withstand water, high temperatures, wear and corrosion, ensuring a longer service life. MULTIPURPOSE USE: Test six different types of trailer light function with just one device. Our 7 way tester performs a complete check of tail lights, brake controller outputs, reverse circuits, turn signals, and 12-volt power feeds, ensuring that all trailer light functions are in very good shape before you take off on the road. WIDE ADAPTABILITY: The trailer plug tester is designed to be compatible with most 7-way trailer plugs which are usually seen on SUVs, trucks, boats, campers, caravans, and other trailers. PRACTICAL DESIGN: The trailer light tester is compact and portable and can be stored in a glove box or tool box without taking up extra space. The PKDOAX trailer plug tester offers exceptional convenience and functionality. With convenient installation and disassembly, it features effortless plug-and-play. Simply insert the 7-pin trailer tester plug into your trailer's connector, activate your vehicle's lights and signals, and check the LED indicators without the need for tools or batteries. The long-lasting construction includes a sturdy nylon body and high-conductivity copper terminals, designed to resist water, high temperatures, wear, and corrosion for a longer service life. Its multipurpose use allows you to test six different types of trailer light functions with just one device, performing a comprehensive check of tail lights, brake controller outputs, reverse circuits, turn signals, and 12-volt power feeds to ensure all functions are in good shape before hitting the road. It also has wide adaptability, being compatible with most 7-way trailer plugs found on SUVs, trucks, boats, campers, caravans, and other trailers. Finally, the practical design makes it compact and portable, easily stored in a glove box or tool box without taking up extra space. Choose PKDOAX for a reliable trailer testing solution.