This is the link where you can buy it, and find some info about it. I would just suggest searching the net for more info. I got mine from www.petguys.com
(the cheapest one i found)
AND I LOVE IT!!! Comfort zone ROCKS! I have had such great experiences from this product. Its unbelievable. I would recommend it to ANYONE with any cat in thier house. It is great! I would love to stay and talk about it, but I've got much to do. But i suggest, getting it. for whatever reason.