Crimestopper CA-5014 Rear Parking Assist System with Rear Mount LED Display For Plastic Bumpers: * 4 ultrasonic sensors with wide detecting angle * Colorful LED display designed to be mounted on the rear headliner of the vehicle * Driver looks in the rear view mirror to view the display * Can be used as a 2-sensor system * Dual intelligent functions for cars with tow-bar, spare tire and other protrusions on the rear bumper of the vehicle * Self-test function * Perfect performance under heavy rain or snowy weather conditions * Detachable sensors with waterproof cable connectors * Audible buzzer * 12V power source * Includes hole saw bit for drilling holes for sensors