Features Good Filtering: The filter element can effectively filter out particles up to microns, such as dust, pollen, pet hair, particle, etc. No More Odours: Moreover, the cotton and activated carbon materials with pore structure enables strong absorption to remove the odour. More Enjoyment: Excellent filtering effects can build you a cleaner living environment, so you can fully enjoy your refreshing home. Reliable Works: Comes with better noise reduction and longer service life, the air purifier filter also ensures stable air flowing. Ideal Matching: Suits perfectly for Xiaomi 1, 2, 3, 4, 2S, PRO, but not suitable for Xiaomi 4 lite, very practical and reliable. Specification: Item Type: Air Purifier Filter Color: Purple Material: High Efficiency Particulate Air, cotton, activated carbon. Applicable Model: For Xiaomi 1, 2, 3, 4, 2S, PRO, but not suitable for Xiaomi 4 lite. Function: With RFID Package List:1 x Air Purifier Filter Note:1. It is recommended to replace the filter every 3‑6 months, or depending on the use.2. This product is not suitable for Xiaomi 4 lite. Package List 1 x Air Purifier Filter