This light bar contains 21 high power dual intensity LEDs. In running light mode the LEDs sequence from side to side in a "Knight Rider" sequence. When the brake is applied the LED will flash for approximately 5-6 seconds then go to a solid on state until the brake is released. Both modes, running and brake, have been designed to create the maximum visibility. The unit comes pre-taped with 3M double sided tape for easy mounting to any flat surface. Simply connect the black wire to any ground wire, the Red wire to your existing brake light wire and the blue wire to an existing running light power source. Works with any 12VDC system, no load equalizer or resistors required. Dimensions: 7.5" long x .7" wide x .7" high. Available in Red