These replacement/additional magnet collar keys (2) are for use with both the door-mounted and glass-mounted cat doors that use Catwalk's new Multi-Magnetic SystemTM. They can serve as replacement keys or as extra magnet keys for additional pets. Simply put a magnet key on your pet's collar. The key will activate the SuperMagnet in the Multi-Magnetic Catwalk Cat Door when your pet approaches the door, and the door flap will open.
Two (2) magnet collar keys are included. Magnetic collar keys are not recommended for kittens under 9 months old.
That being said, this is the best deal I could find online (when you consider shipping & handling & all that). I found 3 sites that wanted to charge me more for the shipping than for the product itself!!
