Most air sterilizers use UVC LED or use plasma and filter together. There are only few plasma-based air sterilizers. 

Klaen adopted Agency for Defense Development’s flexible plasma technology developed against the chemical warfare. The flexible plasma technology maximizes the plasma generation efficiency to generate the plasma with less energy.

Difference from UVC-based Air Sterilizer In case of UVC-based air sterilizers, the sterilization takes place only at the lighted areas. As a result, the microorganisms on remaining air or surface may not be sterilized.