This heavy duty back up alarm from Translectric® automatically stays at least 5 dB(A) above surrounding noise levels, varying in volume from 87 dB(A) to 112 dB(A) max. This alarm operates on 12/24 volt DC and features a universal mounting bracket made of 18 gauge steel. The 22 gauge steel housing seals the unit from dust, moisture, vibration and is steam cleanable and pressure washable. Conforms to SAE J994 and CE requirements, GSA "K-Spec" and has a "life of the vehicle" warranty.