Intelligent door plate and chime
US7053757 Патенты
A system in operable communication with a doorbell chime for audio annunciation of a visitor to an occupant of a room in a multiple room building, the system configured to indicate a status of the room to the visitor or occupant, the system comprising: a Switch assembly configured to convey a message outside of the room; the Switch assembly operable from inside the room; an indicating assembly in operable communication with the Switch assembly, the indicating assembly configured to indicate the message when the message is selected, the message viewable from inside and outside of the room; and
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