The next item is a controller that automatically turns the daytime running lights on and off and dims them when the headlights are on. The system works based on the current mains voltage. When the engine is started - the voltage rises and the controller turns on the daytime running lights, when the engine is turned off - the voltage drops to 12 V and the running lights are automatically turned off. After purchase, everything is ready for installation - because the kit contains the controller itself and the necessary wiring with terminals and fuse.