The PetSafe Microchip Cat Door is the perfect solution for letting your cat out. The cat door reads your cat's unique 15-digit microchip ID, and only allows access to the programmed pet - no more raccoons or stray animals in the kitchen! The PetSafe Microchip Cat Door can program up to 40 pet identities, great for multi-pet households. The manual 4-way lock feature allows you to control your cat's access - set it to lock at night to keep your kitty safely inside the house. This door is powered by 4 AA Alkaline batteries and has an estimated 12 month battery life. The low battery indicator light will flash red when it's time to change batteries. The PetSafe Microchip Cat Door will help give you peace of mind while letting your cat come and go freely!