The locking function gives you the option to set it so your pet can only go out or come in. Or you can unlock both sides. You can also lock it in both directions to the night. While some cat doors only cover the opening, the Locking Pet Door is telescopic. This means the frame will also cover the interior of the door so your pet won’t damage the wood or step into a hollow door by accident. Features - Color: White. - Material: ABS. - Size: 19.8 * 19 * 1.8cm(L * W * H). - This locking pet door, gives your cat or small dog the freedom to come and go without bothering you. - Locking doors can be set in 4 modes: swing out only, in only, both , and fully locked. - Transparent flap lets you and your pet see what’s on the other side of the door. - Easy to install; waterproof and tightly sealed to prevent energy loss, brush strip eliminates noise from the door closing. Package list: 1 * Magnetic Lockable Cat Kitten Dog Pet Entry & Exit Safe Flap Door - Size S (White)