COMPATIBLE REPLACEMENT FILTER FOR Xiaomi air purifiers, This is not a Xiaomi OEM product and is not covered under any Xiaomi manufacturer’s warranty. The Xiaomi brand names and logos are the registered trademarks of their respective owners. This is a high-quality replacement part. This filter is absolutely essential for allergy sufferers designed to filter PM 2.5 smoke, dust, pet dander, pollen, mold pores, fabric and other allergen airborne elements.