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 260556623R Xenon HID Headlamp Ballast Control Unit Module A2C90665801 Installation: The adaptive curve light control power module compatible control unit can be installed on the left or right headlight, replacing the drive module of damaged cars and old headlights, the installation is simple and no modification is required., Manufacturer: YUNLL