XENTEC 55W Advanced Slim Ballast (AC) Replacement ballast for Xentec 55W slim hid kit Ballast: 55w AC Alloy Slim Ballast: Super bright 3500 lumen performance, reduced flickering technology Installation: Plug-and Play connectors. Can be installed on all compatible vehicle. please refer to Sylvania's website and check the existing halogen bulb to ensure correct bulb size, minimum knowledge required as for 90 % of vehicles the product will plug right in the stock plug some vehicles might require a relay harness or a HID decoder in case the lights flicker & or an error in the dashboard appears which is rare 100% Water, Shock resistance, 2 year manufacturer part warranty Includes: 1 of xentec 55w alloy Slim Ballasts