NBS Self Adjusting Back-up Alarm Big Rock Mountain Sale! from 18904 19899 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Self-adjusting white noise 82-102 decibels Back-up alarm White Noise back-up alarm Multi frequency broadband The alarm continuously adjusts Size : H.70 x L.103.5 x P.70mm Sound power from 82 to 102dB +/- 4dB Voltage : 12-24V Weight : 320g Waterproof: IP67 Material: Reinforced fiberglass with nylon coating White noise/wideband alarms have advantages over typical tonal alarms: Sound automatically adjusts 5-10db above ambient noise Broadcast a range of frequencies that are easier to spot Sound is more confined for people in areas that are most at risk Reduced disturbance and noise pollution in the neighborhood Features adjustable sounds for certain environments Tweet