Ooh, I like that! We have a PetSafe SmartDoor, which requires a bulky “key” on the collar. We finally just started leaving it unlocked once we decided to let both cats go out.
Due to some cat behavior issues, we have gone through a lot of Nature’s Miracle products. Their Cat Urine Destroyer and Laundry Boost really work.
In the last 6 months I’ve trained our two 6 year old male cats to use the toilet using the CitiKitty system. It’s so much nicer to simply flush, no scooping or smell. Easier on your catsitter as well, which I feel means they spend more time socializing w/ the cats instead of litter scooping. Wish I’d done it years ago.