Pet Flap Door with 4 Way Security Lock for Dog Cats in 4 Sizes

Features:Easy Installation: Simple and elegant design, easy to set up.High Quality: Made from durable ABS plastic for long-lasting use.Spacious Size: Generously sized to accommodate larger or overweight cats.Four Versatile Modes:Completely closed (no entry or exit)Completely open (free entry and exit)Entry only (cats can enter but not exit)Exit only (cats can exit but not enter)Function Instruction of the Switches:No Entry/Exit: Turn Red and Green switches to both sides, pet is prevented from entering or exiting the house.Entry Only: Turn Red and Green switches to the right side, pet is allowed to enter the house but cannot exit.Exit Only: Turn Red and Green switches to the left side, pet is allowed to exit the house but cannot enter.Free Entry/Exit: Turn Red and Green switches to the middle, pet can enter and exit at any time.Outer Door Frame Size:Small: 20x19x2cmMedium: 20x19x5.5cmLarge: 25x23.5x5.5cmExtra Large: 27.7x25x5.5cmInner Door Frame Size:Small: 16x15.7cmMedium: 16x15.7cmLarge: 19x18cmExtra Large: 22x20cmInstallation Method:Tools Needed: Electric drill, iron saw or electric saw, measuring rulerDraw Template: Use a piece of paper to draw the size of the door cover (allow for minor errors).Mark the Door: Transfer the drawing to the door and mark the seal with a pencil.Drill Holes: Drill holes in the four corners of the marked area; use a chainsaw to cut the hole.For Glass Doors: Use a glass scribing tool to cut gently, then secure with glass glue.Clean the Hole: Clean up the hole, wrap the edges with wooden leather for a neat appearance.Install the Cat Door: Attach the door using the provided screws and a screwdriver.Finish Up: Cover the screw ports with the screw covers provided.Note:The actual color may vary slightly due to different monitors and lighting conditions.Allow for a 1-3 cm measurement deviation due to manual measurement.Size S is thinner than other sizes.