The Superior Electric Fire & Security Alarm bell is an excellent choice for use in fire, burglary, or in general alarm applications. This bell meets or even exceeds the requirement of safety standard. The bell is operational in an ambient temperature range of +31 deg. To +151 deg. F. The moisture resistant design to withstands humidity of 85% RH. For installations where bell is exposed to water, rain, water splash or excessive dust, the use of weatherproof fabricated back box is recommended.