Dog Cat Flap Door with 4 Way Security Lock for Dog Cats Kitten ABS Plastic Small Pet Gate

4 Way Locking: No in & No out( Fully locked) Free in & Out( Fully open) Size S:19.7*19*2cm M:19.7*19*5.3cm L:25*23.5*5.3cm XL:27.7*25*5.5cm Note: Size S is a little different from other sizes. It's "thinner". Function Instruction of the Switches: Turn Red and Green switches to both sides, pet is prevented from entering or exiting house. Turn Red and Green switches to right side, pet is allowed to enter house, but prevent from exiting house. Turn Red and Green switches to left side, pet is allowed to exit house but prevent from entering house. Turn Red and Green switches to middle, pet can leave and exit any time. Outer door frame size Small: 20*19*2cm Middle: 20*19*5.5cm Large: 25*23.5*5.5cm Extra Large: 27.7* 25*5.5cm Inner door frame size Small: 16*15.7cm Middle: 16*15.7cm Large: 19*18cm Extra Large: 22*20cm