Abrams Industrial Heavy Duty Commercial Grade Back-Up Alarm - 112 Decibel - 12-80 Volt Back-up alarm is made for heavy-duty & commercial use for 12-24 volt vehicles Voltage spike and surge protected Reverse mounted speaker enhances sound and protects speaker for longer life - universal mounting bra Electronics are sealed in rock hard epoxy for protection against dust, vibration, moisture & for all Produces a powerful beeping sound that is 112 decibel - Helps warn when the vehicle is backing-up -