Using the WellisAir - Air & Surface Disinfection Purifier, you can remove 99.9% of airborne and surface contaminants. A signal is sent when it is clear. The ozone contains radicals (OH). WellisAir uses these OH particles to kill surface- and airborne viruses. H2O is formed when WellisAir radicals absorb hydrogen molecules from viruses and bacteria and bind them with oxygen. Clean and completely harmless. (OH) technology cleans both the surface and the air of the entire area. Covers rooms and homes up to 1000 square feet based on layout. With WellisAir, you have the best disinfection system available that defeats UV and HEPA techniquesa