The latest technology, simple 1 button programming. Works on your cats microchip and only opens when they approach. Can be programmed for up to 32 pets. RFID collar tags can be used if your pet is not microchipped. 3 year warranty. Flap size 142mm x 120mm. Unsure if your pet will fit? make a template out of a piece of cardboard and see if they fit through easily. Sure Flap Cat Door $170 Plus $92 installation.