Our TSP07 LED ballast socket / plug is designed to eliminate the bulb failure warning becoming activated on vehicles / tractors which are towing trailers with LED lights. It mimics the load of normal incandescent bulb lights and compensates for the low power consumption of LED lights. It will therefore give the driver/operator confidence that should the bulb failure warning light come on in the cab it will NOT be a false alarm. The TSP07 unit can be fitted to any vehicle that requires a standard 7 PIN socket, the LED Ballast Socket / Plug is only used for LED trailer lighting (Not to be used with standard incandescent bulbs). Ideal for people that have various trailers with / without LED lights. Electronics are fully encapsulated against water and vibration.