Give your pet the key to their Electronic SmartDoor™. The Electronic SmartKey™ attaches to your dog or cat’s collar, so when they walk towards the SmartDoor™, the door senses the SmartKey™ 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 SmartDoor™; 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.