Headlight DRL module Control Unit ECU ballast Fitment: Compatible With 3 series E92 E93 X5 E70 Material: The automotive headlight control unit is made of metal, ensuring stability and reliability. Function: The automotive headlight ballast controls current, provides starting voltage, and stabilizes light output. If the headlight brightness suddenly changes or flickers continuously, the ballast needs to be replaced. Installation: Direct replacement, no modifications required. An ideal alternative to faulty parts. Note: We strive to provide clear images and dimensions, please verify the OEM information before purchasing ，to ensure this ballast is the product you need. If you are unsure whether the product is suitable, please feel free to contact me; I will be happy to assist you.