Give your pet the key to their Electronic Pet Door. The Electronic Pet Door Key attaches to your dog or cat’s collar, so when they walk towards the Electronic Pet Door, the door senses the key and unlocks just for them. This gives your pet personalized access to come and go as they choose — not the neighborhood bunny or squirrel. You can add 5 pets to your Electronic Pet Door; just make sure each pet has their own collar key. Your pet deserves the best. Trust PetSafe® to keep your pet healthy, safe and happy.