[Identify Connections]: Ensure your trailer tail lights are properly powered using the ABN Trailer Light Tester; Package includes (1) trailer plug tester
[LED Indicators]: Trailer wiring tester includes 6 LED lights to eliminate guesswork while identifying connections; Use to ensure turning signals, brake lights, and more are correctly working
[Terminal Identifications]: Use 4 terminals of the 4 flat tester unit for testing ground (GND), tail light, left turn light, and right turn light
[Various Blades for Various Designs]: 7 blades of the 4 way flat trailer circuit tester allows you to test for ground, left turn light, tail light, auxiliary power, and more
[For Your Vehicles]: Trailer 4 way tester is designed to work with vehicles that have 12v batteries; 4 way LED tester measures approximately 6 inches (15cm) long