VERSATILE Quickly and confidently confirm the functionality of your vehicles trailer wiring harness with this connector tester for the taillights brake lights reverse lights turn signals electric trailer brakes and auxiliary power SIMPLE TO USE For each electrical function an LED lights up indicating a good signal Just plug the wiring tester into your vehicles socket and have a helper check the LED signals as you activate them from the drivers seat EASY GRIP Plugging in this 7way trailer light tester into your vehicle is easy with its ergonomic design It features two hooks on either side of the tester for a better grip when plugging in or unplugging LONGLASTING LEDS To produce a bright easytoread signal and ensure longlasting use this vehicletrailer wiring tester is constructed with LED diodes DURABLE HOUSING To resist the elements and maintain reliable performance the housing of this tow wiring tester is made from durable black plastic that will never rust or corrode