Features: 1.12V electrical trailer plug & socket wiring tester. 2.7pin flat tester can check all your trailer light circuits on your vehicle. 3.With LED indicators, can indicates failures in the wiring circuits on the car or trailer. 4.If the trailer lights are not functioning correctly, you can isolate the problem by simply looking at the adapter. 5.Works with both the common 7pin trailer plug, used on most SUVs, trucks, boats, trailers and RVs. Specification: Features: 12V electrical trailer plug & socket wiring tester. 7pin flat tester can check all your trailer light circuits on your vehicle. With LED indicators, can indicates failures in the wiring circuits on the car or trailer. If the trailer lights are not functioning correctly, you can isolate the problem by simply looking at the adapter. Made of high quality plastic material, lightweight and durable. Works with both the common 7pin trailer plug, used on most SUVs, trucks, boats, trailers and RVs. Specification: Material: ABS + Brass Color: Black Voltage: 12V Plug: 7Pin Package Weight: approx. 125g/4.4oz Application: can be used on most SUVs, trucks, boats, trailers and RVs (Applicable for standard American vehicles only) Package list: 1 * Trailer Socket Tester PackageList: