S: Product weight 280g size 21*21*3cm M: Product weight 350g size 21.5*21*6.5cm L: Product weight 480g size 26.5*24.5*6.5cm XL: Product Weight 560g Size 25*5.7*28.5cm Cat Door: A great solution for giving your cat access to any interior space while giving you full control. Great for getting into a bedroom, or even a food or litter box with the door closed to keep dogs and kids away. Simple and good design: The transparent flip cover allows pets to see through the door. The outer screen is waterproof. Brush strips reduce noise when closing the door. EASY INSTALLATION: Complete instructions for easy installation on windows, doors, closets and more. 4 Switch Modes: Switch Only Off, On Only, On & Off, and Full Lock to easily control your pet in and out of the pet door The indoor cat door gives your pet easy access to food, water, or the litter box when the door is closed. With this cat flap, your cat will be satisfied and love the freedom the cat door provides. Brush bars reduce energy loss and quiet action without disturbing the sound. The cat won't be afraid of the wind and snow trapped outside, waterproof and tight. You'll have more freedom at home 4 types of closed fly-proof yarn dog flaps allow cats to get in and out as they please, or keep them safely in or out of the house when needed. Lock options include: Open, Open, Two-Way Open, Locked. Quiet This cat flap inner door is very quiet and offers optimum protection against drafts with special seals and magnetic locks. With brush bar for low noise entry and exit.