This same kit works on the 2010-2013 Camaro (All Models) and 2005-2013 Corvettes C6 (All Models).
It's a plug-and-play mini harness (approximately 5" long) designed for the brake/taillight bulb socket on the outside tail lamp housing on theCamaro and Corvette for the years noted above.
Two identical modules come in each kit, one for each side. The sequential delay alters the outer turn signal (brake) light. The circuitry in each module produces a slight delay, which causes the outer turn signal light filament to come on a bit later than the inboard turn signal light. When it blinks, a sequential step between the inboard and the outboard light displays an outward flowing effect as opposed to both bulbs lighting at the same time. The delay is long enough to display a sequential effect, but short enough to prevent a diagnostics "burned out bulb" error in the vehicle.