Our wide variety of back up alarms operate at 12 and 24 volts and provide 97 and 120 dB(A). Many back up alarms are compact in size and have universal mounting brackets to maximize location options. The back up alarms have glass filled nylon housings that provides rugged durability and the epoxy encapsulated circuit board protects the back up alarm from vibration and moisture. The unique grill design on many of our back up alarms meet the requirements of SAE J994 for high pressure wash. Our back up alarms alarm works on positive or negative ground systems and are protected from reverse polarity and voltage transients. Our back up alarms are specifically designed to be a cost-considerate product while meeting our quality standards. Our back up alarms meet OSHA, Bureau of Mines, GSA "K-Spec", all state regulations, is UL Approved, and conforms to the European Council Directive 89/336/EEC. Some are back up alarms are smart enough to know the environment and adjust volume of the back up alarm to be heard but not too loud.