These vibrating bells are designed for use in fire, burglar, or general signaling systems. They offer low power consumption and high sound output. For indoor use, the unit can be mounted on a standard 4" (101mm) square electrical box. For outdoor applications, it can be mounted on either the BBK-1 weatherproof backbox or the BBX-1 deep weatherproof backbox. The BBK-1 weatherproof backbox is identified as Stock No. 1500001.
 
Features:
Suitable for both indoor and outdoor use
Outdoor use requires BBK-1 or HC-BB weatherproof backbox
Indoor use mounts directly to a standard 4" electrical box
Low power consumption
High decibel output
Available in AC and DC models
DC models are motor-driven, polarized, and include built-in transient protection for supervised alarm circuits
Sizes available: 6”, 8”, and 10”