Give your pet the freedom to roam with the SureFlap Automatic Microchip Pet Door. With this in place, your cat or dog and come and go as he pleases no matter the time of day. And, unlike traditional pet doors, this one has security. The SureFlap Pet Door utilizes your pet’s microchip. As your pet 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. The SureFlap Pet Door also works for multi-pet homes. In fact, it can store microchip data for up to 32 different pets. The system runs on four replaceable C cell batteries.