The Power Products 12 / 36V 97-Decibel Heavy Duty Back-Up Alarm is designed to protect against reverse voltage and meet or surpass DOT and SAE requirements. The additional metal housing component provides added durability. This alarm is perfect for any vehicle or equipment that needs to be protected from reverse voltage. It is easy to install and will provide peace of mind knowing that your vehicle or equipment is safe and secure. FleetPride is your First Click in Heavy Duty®.