Model Electric Bells - Electronic Devices
From Valve Accessories
The Potter Model MBA-DC electric Bells are vibrating type bells 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.