Comfort Zone is a plug-in diffuser system for Feliway, which is a pheromone spray to calm and reduce stress in cats. We use it a lot at our cat shelter to soothe the nerves of the savage beasties.

My friends at Cat Faeries have been using and selling Feliway and Comfort Zone for years. You can find out all about them on their web site at http://www.catfaeries.com/feliway.html.

Good luck!

Pat