The Cat Mate Elite uses the latest in R.F.I.D. technology and offers major advancements in pet access control. Entry and exit is operated by unique electronic Collar I.D. Discs (2 supplied) for up to 8 cats - keeps all other animals out. The LCD display shows selected entry and exit lock status, cat location and time since the flap was last used - for up to 3 cats. The cat flap also features individual entry and exit control settings, a timer function (e.g. to keep cats in at night) and a revolutionary, secure 4 way locking system. Only animals with a RFID collar tag programmed into the door can exit or enter the door. 4 AA Batteries (6-9 months) not included. Self-lining to 2” (50mm) - suitable for single/double glazing, doors and panels, including metal. Wall Liner available for wall installation (not included).