The Sureflap Dual Scan Mircochip Cat Flap features dual scan and microchip technology offering you that little bit more control over your cat. The dual scan allows authorised cats outside whilst keeping your other cats indoors and the microchip ensures no intruder animals enter your home, only your cats, by unlocking when it senses your cats microchip. Its simple one button programming allows you to change the permissions swiftly at any time of the day and the manual lock to spot programme is able to stop your cats leaving or entering the house. Compatible with all common identification microchips & RFID collar tags and can store up to 32 different microchip numbers!The Sureflap Dual Scan Microchip Cat Flap is suitable for cats and has a flap opening of 142mm (W) x 120mm (H) - This dimension is the smallest area of the cat flap that your cat will have to enter through.Suitable for installing into doors, windows and walls!Key Features:Set exit permissions for each pet to keep specific pets indoors using DualScan technologyPrevents intruder animals entering your home, including added protection against raccoonsSimple one button programming its easy to change your cats permissions at any timeLow battery indicator light flashes red when the batteries start running low giving you plenty of time to change themStores up to 32 pet identities in memory. Remembers all registered cats even when the batteries have been removedSafety mode - indoor-only pets can gain entry if they escape through an open door or windowUp to 12 months battery life (4 x AA batteries not included). A low battery indicator will flash when the batteries need changingManual lock stops your cat leaving or entering the house. Set to in-only to enable your pet to come indoors without being able to get out againWorks with all common identification microchips and SureFlap RFID collar tags (not included)3 year warrantyFlap Opening Dimensions: 142mm (W) x 120mm (H) - This dimension is the smallest area of the cat flap that your cat will have to enterDoor/Wall Mounting Dimensions: 165mm (W) x 171mm (H) - The size of hole required to fit your cat flapExterior Frame Dimensions: 210mm (W) x 210mm (H) - Size of the exterior cat flap frameGlass Mounting Dimensions: 212mm - A circular hole is required to install the cat flap in glass. The optimum hole size is 212mm, but the cat flap can be installed into holes up to 260mm in diameter.Tunnel Depth: 70mm - Depth of the inside tunnel of the cat flap