Ballast headlight control unit, clear and bright light can help you identify the road ahead and obstacles more clearly, improving driving safety The headlight control module, or HID power regulator, provides the voltage required to activate the headlights and regulates the current to the headlights once they are illuminated HID Xenon Headlight Ballast For Hyundai For Santa For Fe For Focus For Mk3 Stable Control Our xenon headlight ballasts effectively regulate and control current and voltage to ensure the proper function of your xenon headlights. It ensures a stable power supply and minimizes the risk of a sudden increase in current causing the bulb to overheat or explode. Features: Automotive ballast, high reliability, wide adaptability, and can be installed in narrow spaces., Manufacturer: YUNLL