Headlight driver module control computer ballast Fitment: Compatible With A class w177 Material: The headlight control module is made of metal, helping to ensure stable and efficient operation. Function: The headlight drive control module unit is tightly connected to the vehicle's headlights for faster headlight control. 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.