Works with your pet's existing microchip or SureFlap RFID collar tag (one tag supplied with the product) Door opening: 7" (H) x 6 11/16" (W). Prevents intruder animals entering your home Curfew Mode - program the door to lock and unlock at specified times Requires 4 C cell batteries which last up to a year with normal use (not included) The exterior dimensions of the pet door are 10.315 inches (w) x 11.063 inches (h) and the cut out dimensions for mounting into a door/wall are 8.14961 inches (w) x 9.2126 inches (h)