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For Mercedes SLK R171 2004-2011 Ultrasonic PDC Parking Reverse Sensor Vehicle Model_GTV performance and comfort on yourParking sensors, also known as PDC (Park Distance Control) sensors, are an important safety and convenience feature on your Mercedes SLK, helping you detect nearby objects when manoeuvring or reversing. Ultrasonic parking sensors use high frequency sound waves to measure the distance between your vehicle and surrounding obstacles, providing audible warnings to assist with safe parking. The sensors emit sound pulses that are inaudible to the human ear.