What's in the box:

New Vehicle Trailer 7Pin LED Light Cable Circuit Towing Plug Socket Tester 12V Red Wine (Red Wine)

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: 170g / 5.99ounces
Package size: 200 * 50 * 40mm / 7.87 * 1.96 * 1.57inches

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