Reverse Backup Alarms are now available at Commando Car Alarms. We have everything from full-size truck to passenger car Backup Alarm setups to make sure your new car stays new. With range of up to six feet behind your vehicle, never worry about shopping carts or other obstructions again. Ultrasonic waves send a signal to a central control unit that is installed in the vehicle which begins to trigger the Reverse Backup Alarm. The signal is then sent to an LCD screen, or a speaker, or both depending on which Backup Alarm system is chosen. Unit will also operate in up to 140°F of heat! Get your Reverse Backup Alarm today from CommandoCarAlarms.com!