The OTR 12 / 48V 87 / 112-Decibel Smart Reverse Back-Up Alarm is designed to alert drivers of potential hazards when backing up. It is reverse voltage protected and can be mounted horizontally or vertically. This alarm is an excellent choice for any vehicle that needs to be aware of its surroundings when reversing. It is easy to install and provides a loud and clear warning to those in the vicinity. With its dual volume options, you can choose the level of sound that best suits your needs. This reliable and effective reverse back-up alarm keeps your vehicle and those around you safe. FleetPride is your First Click in Heavy Duty®.