Atomic's replacement third brake light will work the same as your factory third brake light (in brake light and cargo light mode) but only brighter and more efficient! When you turn the "warning mode" on, it will act as a warning light. Atomic LED's replacement 3rd brake light plugs into your factory harness for normal brake light and cargo light operation. It comes with an extra plug with two wires: red wire for strobe function and blue wire to change the flash patterns. The kit includes one light, on/off switch, momentary switch and plug for warning mode pattern selection wires.