Feature:1. Applicable Models: This filter is applicable for Xiaomi 1 2 2S 2H 3 3H PRO MAXIMUM, not suitable for Xiaomi 4 lite.2. Better Performance: By replacing the old filter, the air purifier can achieve continuous and qualitative air purification.3. High Efficiency Filtration: Using triple filtration system, with 99.97% high efficiency filtration, making the living environment safer and cleaner.4. Professional Made: This filter is specially made for replacing your old filter. It is recommended to replace your old filter every 3 to 6 months.5. Easy Installation: The filter is very easy to replace and install on the air purifier, you can finish the installation quickly.Specification:Item Type: Air Purifier FilterMaterial: High Efficiency Particulate Air Filter, Cotton, Activated CarbonColor: BlueApplicable Model: For Xiaomi 1 2 3 4 2S PRO (not suitable for Xiaomi 4 lite)Feature: With RFID.Package List:1 xAir Purifier FilterNote:1. It is recommended to replace the filter every 3 to 6 months, or depending on the use.2. This product is not suitable for Xiaomi 4 lite.