Quick Installation - Simple do it yourself project without cutting into walls or doors; patio panel adjusts from 75 7/8 inches to 80 11/16 inches to fit your door frameVariety of Sizes and Colors - Use the sizing chart to find the perfect size door for your best friend; door is available in 3 color optionsPerfect for Renters - Sliding glass door insert is perfect for apartments because the door is detachable so you can easily move it with youEnergy Efficient - The tinted, flexible flap uses a magnetic closure to keep the outside heat and cold out of your homeStrong and Durable - Made to withstand heavy use, the door is built with weather resistant aluminum and shatter resistant tempered glassControlled Access - The slide in closing panel allows you to securely control your pet's access to the outdoors