These vibrating type bells are designed for use as fire or general signaling devices. They have low power consumption and high decibel ratings. The unit mounts on a standard 4" (101mm) square electrical box for indoor use or on a model BBK-1 or HC-BB weatherproof backbox for outdoor applications. Main FeaturesAC and DC modelsDC models are motor driven, polarized, and have built in transient protection for supervised alarm circuitsAvailable in 6", 8" and 10" sizes
