Genuine OEM Mercedes-Benz Parktronic System Control Unit, part number A0009000645. This control unit is the central processing module for the parking assistance system, interpreting sensor data to provide alerts. It is typically located in the vehicle's body structure. Weighs 0.362 kg and measures 0.26m x 0.075m x 0.2m. Genuine OEM control units ensure correct firmware and sensor calibration for reliable operation of safety systems.