Feature:1. The superior 7 pin RV blade trailer wiring tester with LED indicator features 6 LEDs, simple and clear labels function is easy to use.2. For testing circuit for the tail lights, brake lights, reserve lights, left turn signal, right turn signal and auxiliary power.3. Just simply plug into the bumper connection of the tow vehicle, turn on the lights to be tested and check the LED lights on the tester.4. Each of the indicator light with clear labeling to tell you which of your towing vehicle lights work or don't.5. Equipped with two comfortable hooks on either side, fits ergonomic design for better grip, easy plug in and disconnect.How to Use:Plug and Play.Specification:Item Type: Trailer Circuit TesterMaterial: ABS Plastic + BrassColor: BlackPin: 7PinApplication: Commercial vehicles / trailers / RVs / cars / etc. Package List:1 xTrailer Circuit Tester