Includes 2 electronic ID discs to control exit and entry through the flap. Up to 7 unique ID discs possible. Keeps all other animals out. LED display shows selected exit and entry lock status plus low battery indicator. Fully draught and weatherproof brush-sealed flap. Self-lining up to 50mm thick, ideal for single and double glazing. Wall liner available for wall installation. Universal installation facility, 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).