The APS-8L-02 model measures the distance to an approaching object by means of ultrasonic sound. Parking sensors send ultrasonic waves, which are caught by sensors after they reflect from the obstacle. The received information is processed and informed to the driver. Parktronik shows the information on the displays and repeats it by a discontinued sound signal. Displays and sensors of parking sensors are highly accurate and show the driver the direction of the approaching obstacle and the distance to it if it is less than one meter and a half. As the distance shortens, the sound signal repeats more and more often. When the distance is less than 25 cm, the parktronik sound signal become continuous. Parking sensors are installed into the car bumper. This model has 8 sensors: four are installed in the rear bumper, four - in the front bumper.