Specific Xenon adapter for switching from halogen headlights to HID Xenon headlights for Audi Q7 4L High quality adaptation Only one set is needed for both headlights Scope of delivery: Xenon adapter Notes: The added single wires must be connected to the control unit of the on-board power system in order to release the Bi Xenon switch Please keep in mind that in some countries it is prohibited by law to use HID headlights without automatic leveling