1.With 15 super bright LEDs, they are so bright you can see about 10 feet ahead of the truck in complete darkness. Compatible with 1/8 1/10 scale rock climbers, monster trucks, and short-range trucks. 2.The length of the light bar is 2.9 inches (75 mm). The bracket mounting feet face inward for a total length of 3.1 inches (79 mm) and the mounting feet face outward for a total length of 3.74 inches (95 mm ）See the third picture Please measure where you plan to mount it to make sure it fits. 3.The LED light bar can be mounted on the roof for good lighting and balance, or on the hood for better protection in the event of a rollover. 4 screws and nuts are included to securely mount the light bar to the car, you will need to drill 4 mounting holes in the car shell. It can also be attached to the roof rack with cable ties. 4.LED strips are suitable for DC6.0V input, when the input voltage is 6.0V, the brightness and heat generation of LEDs are optimal. When using voltage lower than DC6.0V, the light is dim, red line is positive and black line is negative, the receiver (CH3.CH4.CH5) provides power. 5.Superior quality makes us promise that if for any reason you think this remote control RC light bar is not for you, send a simple email and get a 100percent refund, absolutely no questions asked. This is a professional and practical LED light bar kit, it has 15 LED beads very bright and reliable.