Improve your indoor air quality with this HOMCOM air purifier. The negative ions inside capture up dust and particles as small as 0.3 microns, making the air around you clean, safely breathable and healthy. There are two USB slots on the unit for you to charge small devices easily. Compact and lightweight, it can be carried around easily - a portable piece you\'ll love taking with your everywhere.Features: Absorbs dust, pollen, smoke and more in your area within 20m³ size Portable and small size is perfect for using practically anywhere Low working noise to prevent disturbing you Two USB slots to charge small devices Assembly required