Give your pet the freedom to roam with the SureFlap Automatic Microchip Pet Door. With this in place, your cat or dog can come and go as they please no matter the time of day. And, unlike traditional pet doors, this one has security. This microchip cat device uses your pet’s chip. As your furry friend approaches, the door opens to grant access. However, other animals, whether it’s the neighbor’s cat or a squirrel, cannot enter. This gives you total peace of mind that Fido can come home safely whenever he wants. This microchip dog door also works for multi-animal homes. In fact, it can store microchip data for up to 32 different pets. Finally, the system runs on four replaceable C cell batteries.