The four-way locking cat door allows you to control your cat's access in and out of your home. The four-way lock allows you to choose from four access options: open, locked, in-only and out-only. The open option allows entry or exit, the locked option does not allow entry or exit, the in-only option allows entry but no exit and the out-only option allows exit but no entry. The four-way locking cat door can be installed in interior or exterior doors or walls.