3 high-efficient filters :Removing particles (PM2.5), harmful chemicals, unbearable ordors, etc.;Four sterilization modules (UV-A led 20 ea, TiO2 8 ea): Disinfecting and deodorizing the air flow for up to 6 times; UV-C lamps: Enhancing the sterilizing effects, and the pathogenic microorganisms cannot escape from this path