This is the Key Pack for the Staywell Magnetic 4 Way Locking Classic Cat Flap or the Staywell Magnetic 4 Way Locking Deluxe Cat Flap. Simply attach to a normal collar and when you pet approaches the flap it recognises the chip and it will open for them.
Suitable With Staywell PetSafe magnetic cat flaps Models 400, 420 440, 932 32