It said it was compatible with microchips, but it wasn't for registering my pet's microchip; it only restricts entry by attaching the included tag to the collar. I am selling it because it didn't match my intended use. I took it out of the box to check the operation, but I never actually installed it. The item was shipped from China in a plastic bag, so the box isn't in the best condition. Therefore, I've marked the product condition as "no noticeable scratches or stains." There were two collars and two tags included, which I will also include. Four AA batteries are required separately. I am selling it because it didn't meet my needs, but the product itself seems to be in good working order, with no issues with the tags. I'm attaching the product description from the web below: ochun Smart Cat Door with Advanced Sensing Technology, Automatic Microchip Activated Pet Flap, for Indoor and Outdoor Use, Easy Installation [Automatic Sensing] Equipped with advanced sensing technology, it allows easy entry and exit, preventing unwanted animals from entering while allowing your pet to move freely. [Two-Way Entry] The versatile design allows for both inward and outward movement, allowing your pet to freely explore both indoor and outdoor spaces. [Activated by Collar] Simply attach the collar tag to easily manage your pet's access, eliminating the need for manual operation by the pet owner. [Durable Construction] Made of high-quality plastic that withstands wind, rain, and wear and tear, ensuring reliability and easy cleaning for your pet-friendly home. [Multi-Layer Security] Incorporates automatic locking and tamper-proof access to enhance your pet's security while enabling safe movement between spaces.