Includes 2 electronic ID discs to control individual entry and exit through the flap. Up to 8 unique ID discs possible. Keeps all other animals out. LCD display shows selected entry and exit lock status, cat location, and time since flap last used, all for up to 3 selected cats. Timer function controls access, e.g. to keep cats in at night. Fully draught and weatherproof brush-sealed flap. Self-lining up to 50mm thick, ideal for single or double glazing. Wall liner available for wall installation. Universal installation capability, can fit to glass, wood, metal, or plastic. Size (H)26.5, (W)24.8cm. Door size (H)19.2, (W)16.6cm. Requires 4 x AA batteries (not included).