These vibrating bells are ideal for fire alarms, burglar alarms, and general signaling purposes. They feature low power usage and high sound levels. For indoor installation, the unit can be attached to a standard 4" (101mm) square electrical box. For outdoor use, it can be mounted on a BBK-1 weatherproof backbox or a BBX-1 deep weatherproof backbox. The BBK-1 weatherproof backbox is listed as Stock No. 1500001.
 
Features:
Designed for both indoor and outdoor applications
Outdoor installation requires BBK-1 or HC-BB weatherproof backbox
Indoor installation mounts to a standard 4" electrical box
Low current draw
High dB output
Available in both AC and DC models
DC models are motor-driven, polarized, and equipped with built-in transient protection for supervised alarm circuits
Available in 6", 8", and 10" sizes