The magnetically secured door is great if you live in an area where other animals (raccoons, other cats) might try to get into your home. The magnetic collar key makes sure only your cat can enter and exit. Pet doors can be great for indoor cats as well. Internally installed pet doors can allow your cat to get to "safe" areas in your house (such as the basement) when company arrives, while keeping larger doors closed to protect small children - and your privacy!
More details below...
Features
Manual security lock with four settings:in only, out only, opened, locked
Operated by Magnetic collar key
Helps keep out strays which do not wear collars
Supplied with one collar key and Staywell collar
Universal fitting for windows, wall and doors
Brown finish with See Through Rigid flap
Additional tunnel extensions available separately
Actual product may differ from image - item 420 has a Brown finish