Cheyoll Portable Solar Car HEPA Air Purifier Automation: Power on the button and detect the air quality automatically, device will stop working if the air is good, or it will start working and cleaning the air if air quality is bad. Charging: The solar panel can be as spare charging along with DC 5V battery charging. Could let the air purifier keep running for long time. Scope: It can clean the air up to 20m2, and to indoor air increased the concentration of negative ions and improve the health of people sensitive to excess positive ions. Function: Photocatalyst produce a special effect, which captures 99.97% of allergens with True HEPA filtration including: germs, dust mites, pet dander, plant pollens, bad odors and more. Meanwhile it can adsorb the greater than 0.1mm particles in the atmosphere, clean and refresh the air. Multi Use:The products are suitable for use in many different places, can be used in the car, you can use at home, can also be used outdoors.