Hearing impaired individuals can use this functional unit a number of different ways. Use it as a push button door bell, attach it to your intercom or use it to signal a knock at your door. Completely adaptable, it transmits to Basic or Super Systems. A uniquely convenient piece of equipment for the hearing impaired, its useful whether callers ring, buzz or knock. The Alertmaster Door Announcer requires (1) 9-volt battery which is included.
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