In an earlier contribution to this discussion,
Bob Eager wrote:


Amazing that no-one has yet produced a cat flap that reads the cat's
RFID chip, instead of the heavy magnets.


My Google search found one or two which appear to do this - but I didn't
suggest it to the OP 'cos such a device would be difficult to selectively
disable - whereas something on the collar . .
--
Cheers,
Roger
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