4-Way Switching: Auto-Lock and Entry/Exit Easy to install on your room's door or wall, for cats to come and go. By moving the red and blue buttons left and right, you can easily switch between 4 modes: lock, free, exit, and entry. Door: The surrounding flexible brush prevents noise when opening and closing. Magnets are attached to the bottom of the door, so it won't stay open when your pet goes in and out. Can be used on walls and doors with a thickness of 5mm to 15mm. A template needed for installation is also included. Caution: * May not be usable depending on the size of your pet, so please be sure to check before purchasing. * Installation requires drilling holes in the door. * Please prepare tools such as a saw, ruler, and electric drill to install the door.