How It Works: Your Petporte smart flap® Microchip Cat Flap has been designed to allow your animals easy access to the outside world whilst keeping other troublesome cats out of your house. The Petporte smart flap® cat flaps do not require your animals to wear collars or accessories. The Petporte smart flap® Microchip Cat Flap reads the unique identification number stored on your cat’s microchip that your vet has implanted in your animal. Features • Activated by your cat’s identification microchip • No collar required • Restricts unwanted cats • Timer function – Can be set to lock and unlock at specific times of day • Can be programmed for up to 25 microchipped cats • Installation Guide and Cutting Template Fitting Options: • Fits wooden doors • Fits windows & glass doors, single & double glazed • Fits brick walls • Fits PVC / UPVC & Metal doors Suitable for cats up to 7 kg.