[HID Headlight Ballast Replacement] The headlight control unit, a crucial component of the HID lighting system, provides the voltage needed to start the lamp and regulates the electrical current of the light once it is turned on. A faulty ballast will burn out your bulb. Each ballast is designed to connect directly to your vehicle and does not require programming or coding. [Replace Part Number & Easy Installation] 8A5Z-13C170-A, DL3Z-13C170-A, 8A5Z13C170A, DL3Z13C170A, 3H-60000, R66027, AA3857300DG, 10R-034663, 601-061 [Premium Quality] Made of premium aluminum for better heat dissipation and vibration resistance, 6 protections against overpressure, low pressure, overheating, vacuum, short circuit, reverse connection for safety and durability [Safe Start & Stability] Built-in bag can accelerate the current conduction speed and save power consumption for a start, also can protect the bag from the dust and rain in the engine environment to improve safety Power: 35W Beam Angle: 360'