The starting voltage is 13V+, and the flameout voltage is lower than 12.5V (if it is higher than this value, it be extended for a few minutes until the voltage drops before the light goes out). The total power of a pair of daytime running lights does not exceed 18W (the total power of most daytime running lights not exceed). When the car engine is started, the voltage reaches 13V+, and the daytime running lights automatically light up. When the car is turned off, the voltage is lower than 12.5V (not suitable for cars with a voltage higher than 12.5V after the engine is turned off), and the daytime running lights automatically turn off after a delay of 15 seconds, which is convenient for lighting the owner to go home and realize the delayed light-off function! Tips: After the battery is connected, it is normal for the daytime running lights to light up for about 15 seconds and then turn off (delay function). Wiring method:1. First connect the positive and negative poles of the left and right daytime running lights 2. Connect the red and black wires with fuses on the input end of the controller to the positive and negative poles of the battery, and the red and black wires on the output end to the positive and negative poles of the daytime running lights 3. Connect the yellow wire on the controller to the positive pole of the headlight (or reading light) switch. When the headlight (or reading light) is turned on, the brightness of the daytime running lights be halved (darkened) to achieve the dimming function (the yellow wire can be chosen not to be connected, that is, to give up this function without affecting other uses) The printing/appearance from batch to batch, but it not affect the use; the actual product may have color difference due to different light or display. Voltage: 12-18V Working current: 5A Specification:SK-CD0103: Delay Function. Headlight on, DRL brightness halved. Colour:White&Black Material:ABS Package Contents: 1 x daytime running lights controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.