Description: High quality, lightweight,waterproof. Easy Installation,Direct Plug n Play. Automatic On & Off. DRL will be halved When Turn Low Beam On. Compatible with Most LED DRL Kits. Specification: Material: ABS Color: Black Voltage: 12-15V Current: 2A Dimensions: Approx 4.2x1.8x2.1cm, cable length: Approx 50cm/ 20 inch The red and black wire (the end with a fuse) are connected directly to the car battery + & - . The red wire goes to positive pole of the LED daytime running lights, the black wire of the output end is to goes to the negative pole of the daytime running lights. The white wire is to connect to the headlights (or dashboard lights), when headlights or dashboard lights are turned on, the brightness of the LED daytime running lights will be halved. Package Includes: 1 Piece LED Daytime Running Light Control Dimmer Note: Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) Please check the size measurement and the picture carefully before making payment. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand,Thank you