An automatic cat litter box is generally the size of a large litter pan and have a sensor to detect movement. About ten minutes after the cat has left the box, a rake sweeps from the back of the box and deposits the waste into a covered receptacle in the front (these are also called a self cleaning cat litter box).
Self cleaning litter boxes will need to be used with clumping litter. The packaging says to use a specific brand of litter, but to be honest, any premium brand of clay clumping litter works. The Sweat wheat litter is not good for it, though.
If you have a multi-cat household, I recommend using the wall plug option - more than one cat using the box really uses up batteries. Also, you will need a second litter box for your cats to use - if the box is cleaning itself and your cat needs to go, they will need another option.
If you have a shy cat, there are also cat privacy tents available to cover the automatic litter boxes.
have tried the automatic cat litter box for our cats. They thought it
was a type of toy - someone would get in, pee a bit, hop out and wait
for the rake to sweep it up. As soon as the other cats heard the "click"
of the sensor, they would all come running to watch the action. It
looked like they were watching a tennis match! Then someone else would
get in, pee a bit... This is why I recommend the wall outlet option.
Batteries did not last long for us!
We had the LitterMaid Elite Mega Automatic Self-Cleaning Litter Box.