Connection:
The red and black wire of the input end (the end with a fuse) are connected directly to the car battery. The red wire of the output end is connected to the positive pole of the LED daytime running lights, the black wire of the output end is to connect to the negative pole of the daytime running lights. The white wire is to connect to the headlights (or dashboard lights), when the headlights or dashboard lights are turned on, the brightness of the LED daytime running lights will be halved.