For A5 Q7 89393773 Headlight Control Unit The ballast can provide a stable voltage and current to the light during its activation. Exact fit for plug-and-play. Manufactured from materials, high strength and durability, which has a long service life. The headlight ballast adjusts the current and voltage to ensure that the headlight bulb can quickly and stably reach the working brightness, while preventing the bulb from being damaged by overheating or overvoltage. Xenon headlight ballast control module unit, ABS and internal waterproof circuit board, better heat and impact resistance, workmanship and performance.
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