Package Includes: 1 Pack Blueair 211 plus Replacement Filter Compatible with Blueair Blue Pure 211+ and MAX.(Not suitable for Blueair Blue Pure 211 and 121) Note: This is not a Blueair OEM product and is not covered under any Blueair manufacturer's safeguard. The Blueair brand names and logos are the registered trademarks of their respective owners. Any use of the Blueair brand name or model designation for this product is made solely for purposes of demonstrating compatibility.