This product is used to the trailer power supply wiring whether normal or not. With 7 LED indicators. It is portable and lightweight.  Features: Trailer tester for 7 pins plug and socket connection.  It can test the trailer power supply wiring whether normal or not.  It has 7 LED indicators.  Can indicate any failure in your wiring on the car or on the trailer.  Small size and portable, easy to carry and use.   Specifications: Item type: Trailer Tester;  Material: ABS plastic;  Resistance: 12V;  Color: Gold, blue, red wine(optional);  Package weight: 370g / 13ounces;  Package size: 200 * 140 * 45mm / 7.87 * 5.51 * 1.77inches;   7pin lighting connection-cable function: PIN1-Yellow Wire(Left/Hang Direction Indicator);  PIN 2 - Blue Wire (Rear Fog Lamps);  PIN 3 - White Wire (Earth Return);  PIN 4 - Green Wire (Right/H Direction Indicator);  PIN 5 - Brown Wire (Right/H Tail & No. Plate Lamp);  PIN 6 - Red Wire (Stop Lamp);  PIN 7 - Black Wire (Left/H Tail & No. Plate Lamp);   Package list: 1 * Trailer Tester;  2 * Adapters