The product is a set of 4 genuine OEM TPMS tire pressure sensors specifically designed for Mercedes-Benz vehicles, with the OE/OEM part number A0009057205. They are interchangeable with part numbers A0009058706, A0009052102, and A0009054104. It is essential to ensure proper installation on the front, rear, left, or right side of the vehicle to maintain accurate tire pressure monitoring.