Feature 12 super-bright LEDs. 3M double-sided tape for easy mounting. Work with any 12VDC system with no load equalizer or Resistors required. Non-sequential light bars are dual-intensity and you have a choice of flashing or non-flashing brake alert. Sequential light bar features "knight rider" side-to-side sequencing in running light mode and a flashing brake alert. Sequential LED turn signal light bars will work with flashers that flash between 60-120 times per second (the standard DOT rate); perfect for auxiliary turn signals; single intensity, does not provide a running light. Sold each.