Acoustically activated for existing doorbells or intercoms, or other sound alerting devices
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Place next to the ringer for the existing doorbell – this unit detects the sound and sends a signal to the receivers.
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It is then programmed to "learn" your doorbell ring, so that false alarms are virtually eliminated.
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Must be paired with one of the Bellman receivers such as:
 
Alarm Clock Receiver
Flash Receiver
Portable Loud Receiver
Pager Receiver
 
GST does not apply for this item.