Yes, there is an excellent one - Staywell too I think, which works by
radio frequency. The collar key and the flaps are coded so any cats
next door, using the same system, can't get though your flap. The
keys are small and light-weight and colour coded. Mains (transformer)
or battery operated flap. There is one snag - the key works from a
yard or so away so another cat, waiting by the door, could slip in
first!
>I thought I would up grade and bough a staywell 400 magnetised doodah with
>authentic mouse ball collar, well let me tell you here and now that the
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>
>Thanks.