This product is a Genuine VW / Audi Mass Air Flow Sensor with the part number 06A906461L. It is a sensor designed specifically for Volkswagen and Audi vehicles and is used to measure the amount of air entering the engine. This information is then used by the engine control unit to adjust the fuel delivery and ensure optimal performance and fuel efficiency. The sensor is an important component in the overall functioning of the engine and is made with high-quality materials to ensure accuracy and durability.