The Smart Alarm? from ECCO was the worlds first self-adjusting back-up alarm, constantly measuring ambient noise and adjusting their sound level, creating a volume that is safe without being annoying or contributing to noise pollution. Smart Alarms? eliminate the need for constant manual adjustment and help prevent intentional alarm disconnection. Steel housing and rugged construction for demanding applications. Reverse mounted speaker enhances sound and protects the alarm from dust and moisture ingress. Sealed in epoxy for protection against dust, moisture and vibration.