Quick OverviewThe Car Parking Sensors consists of ultrasonic sensors, digital control box, and LED display. This system detects the distance between the car and back obstruction with ultrasonic sensors installed at the rear bumper of car. Features:Self-test function.Detecting distance: 0-2.5m.2-side, 3 colors.Insert-in and Stick on sensors for option.LED digital display with BiBi sound reminder.Volume switch.Easy to install.4 sensor system and advance chipset for enhanced coverage and detection.Help to prevent dangerous and costly collisions.Help to provide increased safety for passengers, pedestrians and family members who happen to be around the moving vehicle.