This product is a genuine ABS wheel speed sensor designed for use in Volkswagen and Audi vehicles. It has the part number WHT003864D and is used to measure the rotational speed of the wheels and send this information to the vehicle's ABS system. This sensor is an essential component for ensuring safe and efficient braking, as it helps to prevent wheel lock and skidding. It is a high-quality, reliable and durable product that is specifically designed for use in VW and Audi vehicles.