[HID headlight ballast replacement]Headlight Control Unit, a crucial part of HID lighting system, provides the voltage needed to 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 ]W3T21571, W3T23371, W3T22371, W3T24571, W3T24771 33119--G01 BHN3-51-0H3 KD53-51-0H3 8301C463, 8301C770[Fit The Following Models] 3 2013-2017 , -5 2013-2015 , -9 2013-2015 ,--2012 - 2015 ,for -Z 2013-2016 ,for -V 2012 -2015 ,for 2012 -2014[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-in high pressure bag for fast startup & safe stabilityAluminum shell for better heat dissipation and vibration resistance performanceTreated with adhesive glue irrigation for better waterproof & shockproof performanceEasy installation,just plug and play without any program or codeSpecification:: 35WBeam angle: 360'Waterproof rate: IP 68Operation voltage:DC 12VWorking temp: -40 , +80 Shell meterial: aviation aluminum Electric: W3T21571, W3T23371, W3T22371, W3T24571, W3T24771: 8301C463, 8301C770: KD53510H3 - KD53-51-0H3: BHN3510H3 - BHN3-51-0H3for : 33129SZTG01 - 33119--G01colour:Blackmaterial:MetalPackage Contents:1 x 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.