"If they run on batteries with NO wires connecting them to anything, there's
a chance that they're OK." (wrt RFI)
That is not allowed (at least in Texas) and is counter to a reasonably
implemented reliable protection system. The security system "laws" require
that the detectors be connected to the security panel's backup power (if
installed by a licensed firm, dual redundant power sources). But Jim is
correct on their susceptibility to RFI since I had to incorporate measures
to keep my RF from tripping the smoke and heat detectors in the security
system. The amount of wire in a typical system makes for a great antenna or
wireless (power) charger since once I had a nearby lightning strike and all
the door and window reed relay contacts got welded together. Ken K5RG
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