Car Parking Sensor 1,LED display unit 2,Protects against unseen hazards when reversing 3,Comes with 4 Sensors and Alarm Car Parking Sensor - 4x Sensors, ... vehicle, then this parking sensor will sound an alarm to alert you to stop as well as display the distance between you ... object behind your vehicle, on the color LED display! Coming with 4x ultrasonic parking sensors, all the angles will be covered ...