Features: 1.Replacing part numbers for reference: 8K0941597C, fit for A3/A4/S4/A5/S5/Q5/Q7. 2.Quick start with low current, improves the irradiation distance and light range. Pin?type design, compatible with ultra?fast start ballast. 3.Cold start current, no overshoot, speed up the bulb without overpower, and extend the life of the lamp. 4.Advanced electronic ignition technology, stable high voltage output, less interference, strobe up to 10 million times without damage. 5.Offers short circuit protection, circuit break protection, polarity protection, overload protection and load protection. Specification: Item Type: Headlight Ballast_x000D_ Material: Aluminum Alloy_x000D_ Color: Silver_x000D_ Manufacturer Part Number: 8K0.941.597 C 8K0 941 597_x000D_ Other Part Number: 8K0941597 08 09 10 headlight igniter_x000D_ Rated Voltage: 9-16V_x000D_ Rated Power: 35W_x000D_ Chroma: 6000K_x000D_ Life: 50000 hours_x000D_ Bulb Form: Spot light_x000D_ Installation Instructions: Fixed installation, plug and play_x000D_ Fitment:_x000D_ 2009-2013 Fit for A3_x000D_ 2010-2014 Fit for A4 / S4_x000D_ 2008-2014 Fit for A5 / S5 _x000D_ 2009-2014 Fit for A6 / S6_x000D_ 2010-2014 Fit for A7 / S7 _x000D_ 2010-2014 Fit for A8 / S8_x000D_ 2008-2014 Fit for Q5 _x000D_ 2010-2014 Fit for Q7_x000D_ Fit for Sagitar_x000D_ Fit for Magotan_x000D_ _x000D_ Five Protection Functions of Ballast:_x000D_ Short Circuit Protection: If the line in the car encounters a short circuit, it will automatically cut off the power;_x000D_ Circuit Break Protection: automatic monitoring and control when the car is powered off;_x000D_ Polarity Protection: Automatic power off when the positive and negative poles are reversed;_x000D_ Overload Protection: Automatic balance when the voltage and current in the car are overloaded;_x000D_ Load Protection: It will automatically make up when the voltage and current in the car are loaded. PackageList: 1 x Headlight Ballast Note: Please 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!