The Catwalk multi-magnetic cat doors have a similar action to that of the electromagnetic doors. However the Catwalk multi-magnetic cat door does not require batteries, meaning your cat will not be locked out due to battery failure. A four way locking system is provided to allow the owner flexibility with the pets movements. These models have a generous size flap opening and the flap is manufactured from high impact polycarbonate. There are wood fitting and glass fitting models available.