Features: 12-24 Volt DC Manually adjustable 97, 107 and 112 decibel level Stud mounts on 6″ centers Dimensions: 7.2″ W x 3.2″ H x 4″ D Plastic housing 24-month warranty Meets O.S.H.A., Bureau of Mines and state regulations Decibel ratings are +/-4dB (AS) @ 4′ as specified in SAE J994 Oct 03 Solid state electronics sealed in urethane Steam cleanable Voltage spike protected Temperature range of -40F to +185F (-40C to +85C) Each alarm is tested before shipment to ensure the current draw and decibel rating are within exacting specifications