These vibrating type bells are designed for use as fire, burglar 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 weatherproof backbox or BBX-1 deep weatherproof backbox for outdoor applications. Weatherproof backbox model BBK-1, Stock No. 1500001. Features: - Listed for indoor and outdoor use - Outdoor use requires BBK-1 or HC-BB weatherproof back box - Indoor use mounts directly to standard 4” box - Low current draw - High dB output - AC and DC models - DC models are motor driven, polarized, and have built in transient protection for supervised alarm circuits - Available in 6” and 10” sizes
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