Includes control unit, Xenon bulb, and igniter. Integrated headlight assemblies are the accepted standard for modern cars and trucks. Older style “sealed beam” headlamps meant that the entire headlight was also the bulb, and needed to be replaced when burned out. Since the late 1980’s, vehicles in North America are now equipped with headlight assemblies. When a bulb burns out, the headlight assembly stays with the car and only the bulb itself needs to be changed. The assembly is made up of the lens, and the housing, as well as various clips and captured nuts to fasten it to the car. Oftentimes when one of these components break, the entire assembly must be replaced to avoid dangerous headlight performance. Keep in mind if your lens is pitted or hazy, euromotiv carries headlight restoration kits to prevent you having to replace the entire assembly.