The set includes: 4 black sensors buzzer - emitting audible signals, the control unit the hole saw to drill holes in the bumper. Buzzer is equipped with a mute mode. Parki assist system is a device that supports parking and reversing the car. It works on the principle of sonar - emits ultrasonic waves that allows us, after reflection from the obstacle, to conclude what is the distance between car and obstacle. At the time of withdrawal device correctly detects obstacles and warns the driver.