Intuitive display, easy to use interface - Intuitive indoor air quality data with real-time PM2.5 / PM10 display and color-coded light bar. Adjust cleaning settings with simple one- touch touch buttons to meet your air quality needs. Everyday freshness with a long-lasting filter - The filter, made of large-area high-efficiency material and high-volume quality activated carbon , lasts 6-12 months. The Xiaomi Smart Air Purifier 4 Pro is equipped with a three-in-one filter , including a primary filter, a high-efficiency Xiaomi filter and a high-quality activated carbon filter that cooperates in cleaning. Intelligent control - Start air purification anywhere, anytime with Mi Home / Xiaomi Home . Activate the air purifier on the go to keep your home fresh when you arrive. Low noise and night mode - High quality air that will let you sleep undisturbed. Switch to night mode and turn off the display brightness . Your purifier will maintain air circulation, giving you the perfect environment for a healthy sleep. Easily clean the removable top grille - To protect the children in your house, the top grille is bolted on and cannot be removed at random. Unscrew and remove the grille for easy access to the fan blades and air ducts. Clean the inside of your cleaner to prevent secondary contamination.