• Only one filter for use for up to one year. Daily freshness with long-lasting filter • Although the all-in-one filter is durable, performance may gradually deteriorate over time. It is recommended to replace the filter every 6-12 months. • Mi Home / Xiaomi Home App connection Filter replacement reminder on smart devices • You can view filter usage at any time on the Mi Home / Xiaomi Home App which estimates filter replacement time based on your usage. • High-Quality Activated Carbon • 650,000mg* high-quality activated carbon, with advanced porous structure and evenly distributed carbon, effectively removes air pollutants and harmful odors in your home. • 360 degree primary filter prevents large particles • The primary filter provides primary filtration by filtering out dust, hair and fine crumbs among other large particles and is resistant to wrinkles, oils, acids, alkalis, etc. to ensure a long service life.