Cat door dimensions (the narrowest part of the opening through which your cat enters):142 mm (width)x 120 mm (height)

Included in delivery: SureFlap DualScan Microchip Cat Flap, screws of 3 different lengths, user manual Usesfour AA batteries (in normal conditions, batteries will last up toone year). Batteries are not included - we recommend using high-quality batteries and recommend against using rechargeable batteries The electronic SureFlap DualScan Microchip Cat Flap allows cats to enter and leavebased on the microchip implanted under your cat's skin. The flap only opens for your cat, which means that stray cats will not be able to enter your home. The SureFlap DualScan cat door is like the standard SureFlap Cat Flap, except that it has a double antenna that scans cats that both enterand exitvia the cat door. To install in a window, a wall or an existing cat door opening, you will need a standard mounting adaptorWhat does the double antenna do? This additional functionality is essential if you have 2 cats and you only want one to come and go as it pleases, whereas you do not want the other cat to go outside (the standard SureFlap cat door model cannot be programmed to only allow certain cats to exit the house).

No collar or tag is required, which means there is no risk of your cat losing the tag or getting caught on anythingCompatible with RFID tags (= a SureFlap radio frequency identification tag that can be used with animals that don't have a microchip implant); however, the tag is not included with the cat door