Okay, so stay with me. This starts out like just a litter box on top of your toilet. As your cat gets used to the location and doing his/her business perched on the commode, you start to cut out the inner rings, until you're left with just the toilet and a perfectly toilet trained kitty. Results will vary due to cat personalities. But you knew that since you're shopping for a cat.
Note - this doesn't come as a set unfortunately so you'll need to buy the bottom plate and the inner tray separately.
