Let all of your cats use your magnetic cat flap or replace your cat's current magnetic collar key. This PetSafe® Staywell® Magnetic Collar Key is compatible with Staywell® Magnetic Cat Flaps (400 and 900 Series). The collar has an elastic strap designed just for cats, but you can take off the key and use it with any cat collar. Your pet deserves the best. Trust PetSafe® to help keep your pet healthy, safe and happy. FeaturesPerfect for multiple cats – Buy a magnetic key for each of your cats so they can all use your magnetic cat door Use with any cat collar – Key is easy to remove from the elastic strap to pair with your existing cat collar Comes with elastic strap – Designed for cats, the elastic strap is comfortable and easy to put on Compatibility – Works with PetSafe® Staywell® Magnetic Cat Flaps (400 and 900 Series) System Includes (Accessories)• 1 Magnetic Collar Key• 1 Strap
