Product introduction: Specification: Color: white Material: plastic Product size: 20 x 19 cm Features: 1. Updated wiper bar: provide a fixed groove with a buckle for the wiper bar to be fixed the wiper bar securely. Even if the brush strip falls off, you can easily reposition it in the mounting groove. This greatly helps the brush bar to reduce noise and prevent raindrops, wind or mosquitoes and other pests as much as possible. 2. Safe and Thoughtful: The pet can see through the door through the transparent flap. The outer rain seal is waterproof. The brush strip eliminates noise when the door is closed. The 4-way smart door control gives the cat more freedom. The inside edge of the frame is polished to avoid hurting the cat. 3.4 Way Switch Mode: The flap door can be customized with 4 modes: exit, entry, entry and exit, and full lock. Give the cat as much freedom as it wants. 4. Excellent Quality: Made of weatherproof ABS material, the surface is smooth and durable. Packing list: 1 pet door Installation method: Tools needed: electric drill, iron or chainsaw, tape measure; Step 1: First, use a piece of paper to record the size of the door cover (there may be a few millimeters of error); Step 2: Draw the pattern on the door and trace it with a pencil; Step 3: Use a drill to drill a hole in each of the four corners of the drawn door, then start digging directly if you have a chainsaw; Step 4: If it is a glass door, open it gently with a scraper and fix it with glass glue; Step 5: Clean the hole, now make a layer of scalp to wrap the hole for pretty patterns; Step 6: Install the cat flap, there are accessory screws, screw them with a screwdriver; Step 7: The screw door is also equipped with a screw cover, press it, OK and it's done Note: 1. Please allow 0-2cm error due to manual measurement. Thank you for understanding. 2. Actual color may be slightly different from the picture due to the light and brightness difference on your monitor.