This air purifier releases negative ions to keep the air fresh and keep you refreshed after a hard day's work. The filter element is extremely efficient, has a large surface area and is rich in high-quality activated carbon. Equipped with a sensitive high-precision laser sensor, it can monitor changes in air quality. Purify the air efficiently in automatic mode - the purifier monitors the air quality in real time and automatically adjusts the purification speed. Support smart control, so you can breathe clean and fresh air whenever you come home. Using the Mijia APP on your smartphone, you can activate the air purification function at any time even when you are not at home. Real-time PM2.5 display and color indicator light for indoor air quality data at a glance. Adjust purification settings with a simple touch of a button to meet your air quality needs at the touch of a finger. Switch to night mode, turn off the screen lighting, and the purifier will not glow or be noisy when it is running. The purifier keeps the air moving, giving you the best possible environment to sleep soundly. Loosen the screws and remove the grille to gain access to the fan blades and air ducts. Easily clean the interior of the purifier to prevent secondary pollution. Combining two filtration technologies: electrostatic charge and mechanical filtration, Xiaomi high-efficiency filter media can remove 99.97% of suspended particles (as small as 0.1 microns), blocking dust, PM 2.5, pollen, pet dander, smoke, and even extremely tiny microscopic particles plastic. The filtration rate of Xiaomi high-efficiency filter media for 0.3-micron particles is 99.97%, and the filtration rate for 0.1-micron particles can reach 99.99%.