Car Laser Rear Fog Light Warning Lamp Anti-Collision Taillight - DC 12V ~ 24V, Laser Wave Length: 650 mm, Water Peoof Grade: IPX4 - This makes car driver behind pay more attention to keep more safe distance - Sunny days, It can be seen only a red line on the road. - Rainny or Foggy days, A red fan shaped beam in the air can be noticed. - * Connect to license plate light line (Recommend), you can connect to the brake light line, rear fog light line,and warning light line as well. * Use the screw to fix the light, and adjust the suitable angle to get the safe distance you want.