Microchip cat flaps but multiple entrances?

[bellac11]

I seem to be overun with cats coming in through our cat flaps and eating our cats food.

In particular, minding my own business last night, one of them came in the front room and sprayed up our cats scratching post, in front of me

It doesnt smell for some reason, I think he might be very young but I cant have that happening, thats worse than the cat food getting stolen.

So Im now forced to think about a microchip cat flap but there are two problems with this, one is that we have 3 flaps for the cat to roam as she likes and come in to which bit she likes etc (although this could be just 2) and the other is that she will not use a collar

What to do, what options do I have?

Mine has been in for nearly 3 years and is on its second set of batteries.

Ours is a Sureflap but its ten years old so the same model is unlikely to be a available. The batteries last at least a year in fact I only recall changing them a handful of times, that's with 2 cats.

We've had a sureflap one for over three years, and I replaced the batteries for the first time last week. It was telling me they were running out for AGES (like, a year) before they finally went though, so you just have to ignore its drama and hold your nerve 😁

I've got this, from Argos, which is the same price as it is on Amazon, plus easier to return if there's a problem, plus nectar points, plus they pay their taxes.

Ours is also the same basic Sure flap everyone else seems to have. It’s been fantastic. Some tips:
-we use rechargeable batteries, they only need recharging every 6 months or so. A red light starts flashing on the flap when batteries are getting low and gives plenty of notice - like a week or so.

-after nearly 10 years the first flap died of sheer old age but the models haven’t changed at all, so we got an exact replacement from Amazon which made fitting it easy.

-The one time it stopped working, it took us ages to figure out what was wrong. Turned out that the cat’s microchip had migrated right down his back. The vet just put a new chip in right up on top of his shoulder blades, and everything was fine.

Yes, that does look exactly like our 10 year old one