This set includes one PetSafe magnetic collar key and collar. It works with the PetSafe Magnetic Cat Door (formerly called the Staywell 480), as well as the Staywell 932. Both of these models are discontinued, but the collar and magnetic key set is still sold here. The adjustable collar fits cats of varying sizes, and the magnetic collar key fits on any type of collar. The small, 0.8" magnet is lightweight, and won't irritate your kitty. It serves to only allow access to cats wearing it, which prevents neighborhood cats and strays from getting in.
