1 &gt; 4 Switch Modes: Four independent patterns to lock with switches-swing out only, in only, in and out, and fully locked, making it easier to control your pet in and out;2 &gt; Applications: Exterior Dimensions: 23.4 x 24.9 x 2 cm (W x H x D), Interior Dimensions: 19.1 x 20.6 cm (W x H), suitable for installation on doors and thin walls, suitable for cat lighter than 8 kg and waist circumference less than 60 cm3 &gt; Easy to Install: Full instructions provided, make you easily install in windows, doors, closets, etc. ;4 &gt; Groomed: Clear pet flap allow see through door. Outer screen is waterproof. Strip brush reduces door closing noise;5&gt; Quality Guarantee: Made of ABS plastic, weatherproof, the surface is smooth and durable; 4 locking ways: in and no out (fully locked) free in and out (fully open) in only outside only Switch instruction function: 1. Turn red and green switches to two sides, Pet is prevented from entering or promising house. 2. Turn red and green swithes to right, Pet is allowed to enter House, but avoid Promising House. 3. Turn red and green switches on the left side, Pet is allowed out house but avoid entering your house. 4. Red and green turn switches in the middle, Pet can leave in and out at any time. depet car door specifications: Material: ABS plastic < p>Color: White Style: Flap Outer Size 9.2" x 9.8" x 2" (W x H x D); Dimensions: 7.5" x 8.2" (L x H); Weight: 0.52 kg Fit cats up to 20 lbs (waist size less than 60 cm) Included in delivery: 1 x Pet Cat Flap Door (screws included) 1 x complete installation instructions Note: 1 &gt; error due to manual measurement, 1~2mm difference in size is normal, thanks. 2&gt; Please make sure the width and height (shoulder level) of animal are smaller than the screen door, thanks.