• SELECTIVE ENTRY PET DOOR: Scans on ENTRY ONLY. Uses RFID to read your pets implanted ID microchip, allowing your pet access without letting in stray animalslearns up to 32 identities; programmable collar tags are sold separately for pets without microchips. SIMPLE ONE BUTTON Programming. Helps prevent intruder animals from entering your home. SET CURFEW TIME!: Program the door to lock and unlock at specified times. RESTRICTED ENTRY ONLY - any animal can exit.
• MICROCHIP COMPATIBILITY: Works with 9 (Avid Secure), 10 (FDXA) and 15 (FDXB) digit microchip numbers; if unsure of your pets microchip number, you can check with your veterinarian, pet shelter or animal rescue.
• DOOR OPENING: The Microchip Pet Door Flap opening is 6 11/16 (H) by 7 (W) and can be installed in doors, windows or walls accessories are available from SureFlap.
• BATTERY POWERED: Uses 4 C non-rechargeable alkaline batteries (not included); estimated battery life up to 12 months depending on use. LOW BATTERY INDICATOR: Light flashes red when batteries are low and indicates batteries will need to be replaced soon.

Looks and appears in used, great condition. Not tested. All pieces included. See pictures for details.