Made from aluminium for durability and with a built-in high voltage pocket for greater reliability and safety, with 6 types of protection: no-load, overvoltage, overheat, low voltage, short circuit and reverse connection. The ballast replacement, a key part of the HID lighting system, provides the voltage required to start the lamp and regulates the current once the lamp is lit. direct installation or replacement, just right in without any programming or coding, no additional modifications required. Direct Replacement - A direct replacement for your existing parts. Plug and play, no need to programme or code your car. Please make sure the OE number matches the part you are replacing, if you are not sure,please feel free to contact us at any time .