Have any of you had any experience with automatic petdoors?

[alphafemale]

The kind where it only opens for one pet and the pet wears a sensor on the collar?

It's going to be on an inside door.

We are looking to get a feline fuzzbutt and the only feasible place for a litterbox is a back bedroom.

Thing is the dog sees that as an indoor toilet if the door is open.

She has already been cat tested an is cat tolerant but I think this would also give kitty a way to be left with a room of her own when she so desired.

If any of you have one you've found good or bad I'd love to hear it. Looks like these things are anywhere from a Grant to a Benny or more. Don't want to throw that away on a piece of junk.