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.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.Key Benefits Set exit permissions for each pet to keep specific pets indoors using DualScan technology Prevents intruder animals entering your home, including added protection against raccoons Simple one button programming its easy to change your cats permissions at any time Low battery indicator light flashes red when the batteries start running low giving you plenty of time to change them Stores up to 32 pet identities