We've transitioned our alarms to a wireless central connection type that reports to a central alarm console and kept the ones that came with the home. This plug plugs the hole in the ceiling where the old alarm used to be. The only complaint I have is that the screws that came with the unit had slots that were so small that they were difficult to tighten once the plate was in place. A larger slotted screw or Phillips would be an improvement.
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