[Efficient H13 HEPA Filter Purification] VEWIOR air purifier uses an H13 True HEPA Filter and has international CARB certification, FCC certification, ETL certification, etc, so it can easily filter particles as small as 0.2 microns in the air, such as dust, smoke, pollen, hair, and odor. Featuring 360° air intake and top outlet, the A2 air purifier refreshes the air 5x per hour in rooms up to 1560 ft² in one hour. [Smart Air Quality Monitoring with Light] Air quality monitoring is one of the biggest features of this VEWIOR air purifier. And the built-in air quality sensor can intelligently detect the surrounding PM2.5 value. Purification is clearly visible. There have three colors of air quality lights, with the "Light" button controlling on/off, which represent excellent (green), good (blue), and poor (red) air quality.