These are D2-connector 2A88 CANBUS 35 watt HID ballasts from HYLUXTEK. With true OEM-grade manufacturing these ballasts are intended to perform for years with absolutely zero failures. If you have a D2 OEM HID setup with a failed ballast you can purchase one of these to get back up and running at a fraction of the cost of a new ballast from the dealer. You'll simply need to tap the positive and negative input wires into the power wires powering your original ballast. This ballast should be used with D2 bulbs only (D2S D2R D2C etc). If you have a D1 bulb or a standard aftermarket AMP HID size such as 9006 H1 or H11 please use our AMP or D1 ballast instead. Most ballasts these days run with digital signal processing (DSP). This allows for a much smoother and more reliable power output faster warmup and longer bulb life. However most digital ballasts still use standardized computing chips to process the information. It is very cost-efficient to use standard chips off the shelf. Instead the HYLUX uses a computing chip designed specifically for the purpose of running an HID bulb. This is known as an application-specific integrated circuit (ASIC). While this is much more expensive than a generic chip it allows the HYLUX ballast to operate with extremely high efficiency and performance far exceeding that of any generic ballast on the market.The ballast is fully sealed in electrically-safe sealant material known in the industry as potting. It's not just coated like cheaper ballasts instead it is filled to the brim making the ballast completely waterproof and shockproof. The ballast will make a humming noise during operation- most assume this is bad but actually it is primarily a result of microscopic air pockets resonating inside audible proof that the ballast is completely airtight.