HEPA filter with H13 filter material, UV-C light technology and ionizer. Triple action purification with UV-C light helps reduce certain viruses and bacteria.* HEPA filter removes PM 2.5 particles, pollutants, dust, smoke, and allergens. Ionizer improves filter efficiency and helps remove airborne particles. Filter replacement light alerts when the filter should be checked and if necessary, replaced to always guarantee an optimal filter performance. Easy and simple operation *Eliminating Bacterial Rate (Staphylococcus albus 8032 - 99.99%, Escherichia coli 8099 - 99.99%) according to GB21551.3-2010 Virus Removal Rate (E. Coli Phage Phi-X174 - 99.98%) according to GB/T 18801-2015