Crimestopper Reverse Parking Sensor System with Four-Direction LED Display - Backstopper™ CRM CA5010, The Crimestopper Backstopper™ CA-5010 is a rear impact warning sensor system designed to aid the driver when backing up their vehicle. The system includes a color LED digital display with a four-sensor direction indicator mode and (4) ultra-sonic sensors with "quick disconnect" waterproof connectors., The colorful LED digital display has a built-in buzzer for visual and audible warning. The display also has a four-sensor direction indicator which allows the driver to see which sensor is being set of the most. This is useful to allow you do know exactly where the obstruction is behind the vehicle. The design is a top-dash mount design which makes the display easy to mount in several locations such as the top of the dash board, inside a pocket or on top of the rear view mirror., The sensors wide detection angle will alert the driver of any small children, pedestrians, animals or small unseen objects such as bicycles or parking poles. This makes it very convenient for parking in a parking garage, a crowded lot or even in your own driveway.