Parking sensors are generally divided into two categories.
Electromagnetic Parking sensor
The electromagnetic parking sensor relies on the vehicle moving slowly and steadily toward the object. Once the obstacle is detected, the vehicle is temporarily stopped and the sensor will be given a signal of the presence of the obstruction. The electromagnetic parking sensor provides a unique design that is installed discretely on the inside of the bumper.
Ultrasonic reversing Sensor
Currently, ultrasonic sensors can be seen in several brands of cars, with various brands such as Parktronic parking assist. Some systems also provide additional upgrade packs that will be installed later.