Our Intelligent Back-Up Alarm measures the ambient noise level and instantly adjusts to produce a beep sound louder a 5 decibel louder than the surrounding noise. The electronics are sealed in epoxy for protection against dust, vibration, and moisture. Universal mounting bracket and wire leads makes installation easy. Black painted steel housing is rugged for demanding heavy-duty commercial applications. Operating voltage 12-24 volts. Decibel output: 87-112.