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:_x000D_ _x000D_ 12V electrical trailer plug & socket wiring tester. _x000D_ 7pin flat tester can check all your trailer light circuits on your vehicle. _x000D_ With LED indicators, can indicates failures in the wiring circuits on the car or trailer. _x000D_ If the trailer lights are not functioning correctly, you can isolate the problem by simply looking at the adapter. _x000D_ Made of high quality plastic material, lightweight and durable. _x000D_ Works with both the common 7pin trailer plug, used on most SUVs, trucks, boats, trailers and RVs. _x000D_ _x000D_ Specification:_x000D_ Material: ABS + Brass_x000D_ Color: Black_x000D_ Voltage: 12V_x000D_ Plug: 7Pin_x000D_ Package Weight: approx. 125g/4.4oz_x000D_ Application: can be used on most SUVs, trucks, boats, trailers and RVs (Applicable for standard American vehicles only)_x000D_ _x000D_ Package list:_x000D_ 1 * Trailer Socket Tester PackageList: