This extra SmartKey™ can be used for an additional pet using your Electronic SmartDoor™. Our innovative Smart Door™ recognizes the SmartKey™ worn on your pet’s collar and unlocks the pet door. After your pet has passed through and the SmartDoor™ no longer senses your pet's SmartKey™, it automatically locks back into place. Each SmartDoor™ can program upto 5 SmartKeys™.
Please note that the SmartKey is not waterproof.