it releases a large number of negative groups to the air by special ... thus play a bactericidal purification, removal of formaldehyde, air disinfection, corrosion preservation, the role of odor removal. Specifications: Ion Output:4, ... roomQuite operationCompact and portableEasy cleaning /change filters designSafe, economical of Plasma technologyCE & RoHs CertificateBenefits:Freshens stale airSafe, quiet ...