This product is a genuine alternator manufactured by Volkswagen (VW) and Audi. The part number is 028903028D. It is designed to be used in various VW and Audi vehicles as a replacement for the original alternator. This product is of high quality and is an authentic OEM (Original Equipment Manufacturer) part. It is specifically designed to fit and function like the original part, ensuring proper performance and compatibility with the vehicle. This alternator is an essential component of the vehicle's charging system, responsible for converting mechanical energy into electrical energy to power the vehicle's electrical systems and recharge the battery.