For Mazda for CX5 for CX9 Headlight Driver Module Function: The headlight ballast regulates current and voltage, ensuring the headlight bulb quickly and stably reaches its working brightness, while preventing bulb damage due to overheating or overvoltage Features: With its design, this ballast meets the specific requirements of automotive technology, ensuring your headlights always maintain optimal performance Replacement headlight driver module, high brightness and stable fit for many models。 Car xenon ballast kit, fast start light up without delay, silent operation without heat。, Manufacturer: DYOG