Someone knows ready RF the set of reed switch sensor door opening and several receivers of this signal?

For problem tacit information about the openness of the door in several places at once - maybe someone saw a set from one of the wireless reed switch sensor (such separately - mountain) in the housing with a battery, but with some receivers of this signal that shows the status just svetodiody silently ?
Of course, each unit would be in its housing with the battery offline as long as possible.
April 7th 20 at 10:47
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