[HID headlight ballast replacement]Headlight Control Unit, a crucial part of HID lighting system, provides the voltage needed to start the lamp and regulates the electrical current of the light once it is lit. A failed ballast will cause your bulb to burn. Every ballast is designed to connect directly to your vehicle and requires NO programming or coding.[Replace Part Number & Easy installation ]A2189006604 - A218 900 66 04 -2189006604 A2189009904 - A218 900 99 04 -2189009904 A2129005424 - A212 900 54 24 -2129005424 A2129008222 - A212 900 82 22 -2129008222 A2129008324 - A212 900 83 24 -2129008324 A2189000406 - A218 900 04 06 -2189000406 A2189007306 - A218 900 73 06 -2189007306[Premium quality ]made of premium aluminum for better heat dissipation and vibration resistance,6 protections against overpressure,low pressure,overheating,no-load,short circuit,reverse connection for more safety and durability[Fast startup & safe stability]built-in high pressure bag can current conduction speed & save power consumption for fast startup,also can protect high pressure bag from any dust & rain in the engine environment to enhance securityTreated with adhesive glue irrigation for better waterproof & shockproof performanceEasy installation,just plug and play without any program or codeSpecification:Color: silvermaterial: metalPower: 35WBeam angle: 360Waterproof rate: IP 68Operation voltage: DC 12VWorking temp: -40 , +80 Fitment:for 2015-2017 CLS400,for 2015-2018 CLS550,for 2015-2018 C63 S,for 2014 E350,for 2015-2017 E400,for 2014-2017 E550,for 2016-2018 GLE350,for 2016-2017 GLE400,for 2017-2019 GLE43 ,for 2016 GLE450 ,for 2016-2018 GLE550 e,for 2016-2018 GLE63 ,for 2016-2019 GLE63 S,for 2017-2019 GLS450,for 2017-2019 GLS550,for 2017-2019 GLS63 Package Contents:1pc * Headlight BallastOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.