E-Class Xenon HID Headlight Ballast Module For Mercedes 2129007804FEATURES: Canbus HID Ballast,Slim and easy for installation. MATERIAL: Aluminium alloy housing ballast,better heat dissipation than other plastic housing. prevents flickering by adapting to the electronic pulses of your vehicle, which offer faster and quieter performance. LOW POWER CONSUMPTION: 45% less power consumption, up to 3000 hours Life Expectancy, Constant power output, energy saving, protects the HID bulb from damage and provides long