Cats bury their waste in a litter tray to hide the odor from predators. This is a survival instinct. When they use the toilet instead of the litter tray the water in the pan hides the odor more effectively and the cat is satisfied. The Litter Kwitter leads the cat through three stages of behavior modification to teach the cat how to balance on the toilet, how to aim correctly into the pan and finally how to go without the need for litter. It fits all standard toilets and ships with a step-by-step training DVD plus a full-color instruction book so anyone can do it. The special white seat starts on the floor next to the toilet with the red training disc full of litter just like their regular litter tray. Later, the whole thing is placed on the toilet rim so your cat learns to hop up to go. This takes around 2-3 weeks on average.