I've been asked about these but haven't seen one in place yet but the blurb on their website reads pretty good. I presume you can just add more chips depending on the amount of cats you have.
I'm just a little worried about the teething probs because at £125 for a catflap plus the expense of having it fitted (if you don't have anyone to do it for you) it could work out very expensive should you have to have another one refitted if the first one failed.
I don't have a catflap into my catproofed back garden because Angel, one of my dogs, is the cats' personal doorman and can open any door in the house quicker than I can and whenever one of the cats approaches the back door, she simply opens it for them....letting in all the icy droughts at the same time.
I will follow this thread with interest though because many of my customers ask me about new and innovative products.
Here's the link to Pet Porte's website:
http://www.microchipcatflaps.co.uk/order.htm Best wishes,
Roz