1Replacing part numbers for reference: 8K0941597C, fit for A3/A4/S4/A5/S5/Q5/Q7. 2Quick start with low current, improves the irradiation distance and light range. Pintype design, compatible with ultrafast start ballast. 3Cold start current, no overshoot, speed up the bulb without overpower, and extend the life of the lamp. 4Advanced electronic ignition technology, stable high voltage output, less interference, strobe up to 10 million times without damage. 5Offers short circuit protection, circuit break protection, polarity protection, overload protection and load protection. Item Type: Headlight Ballast Material: Aluminum Alloy Color: Silver Manufacturer Part Number: 8K0.941.597 C 8K0 941 597 Other Part Number: 8K0941597 08 09 10 headlight igniter Rated Voltage: 9-16V Rated Power: 35W Chroma: 6000K Life: 50000 hours Bulb Form: Spot light Installation Instructions: Fixed installation, plug and play Fitment: 2009-2013 Fit for A3 2010-2014 Fit for A4 / S4 2008-2014 Fit for A5 / S5 2009-2014 Fit for A6 / S6 2010-2014 Fit for A7 / S7 2010-2014 Fit for A8 / S8 2008-2014 Fit for Q5 2010-2014 Fit for Q7 Fit for Sagitar Fit for Magotan Five Protection Functions of Ballast: Short Circuit Protection: If the line in the car encounters a short circuit, it will automatically cut off the power; Circuit Break Protection: automatic monitoring and control when the car is powered off; Polarity Protection: Automatic power off when the positive and negative poles are reversed; Overload Protection: Automatic balance when the voltage and current in the car are overloaded; Load Protection: It will automatically make up when the voltage and current in the car are loaded. 1 x Headlight BallastPlease double check the part number of your item, matching information is for reference only. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks