Pet Mate Cat Mate Elite Chip And Disc Superselective Cat Flap Mixed, , 10.5" high 5.7" wide Access with implanted microchip or collar ID Disc(not included ref. 310). Requires 4 AA Batteries 9-12 months use LCD Display shows selected entry and exit lock status, cat location and time flap last used for up to 3 cats Self lining up to 4 inches, ideal for most types of installation Fully draft and weatherproof brush sealed flap. Frame Rain Seal