Microchip Pet Door for large cats & small dogs.The new SureFlap Microchip by Giant Savings" href="http://www.sureflap.co.uk/products/details/19-microchip-pet-door##">Pet Door is the first to be designed to meet the needs of large cats and small dogs. Size of pet door aperture 27mm X 32mm (10.5" x 13")Works with a pet's existing identification microchip or RFID collar tag (one tag supplied)Compatible with all microchip formats worldwideSuitable for multi-pet households (up to 32 pet identities)NEW Curfew Mode: program the door to lock and unlock at specified timesNEW Double Lock Mechanism for increased security against intruder animalsFits into doors, windows and wallsBattery powered: 12 months typical battery life 3-year warranty Flap Dimensions 178mm (W) x 170mm (H) This dimension is the smallest area of the pet door that your cat will have to enter. Hole Dimensions 207mm (W) x 234mm (H) The Installation Template can be used to cut the hole required to fit your pet door. Tunnel's Interior Dimensions 188mm (W) x 212mm (H) Tunnel's Exterior Dimensions 199mm (W) x 224mm (H) Tunnel Thickness 5mm Exterior Frame Dimensions 262mm (W) x 281mm (H)