3 high-efficient filters :Remove dust,particles (PM2.5);Four sterilization modules (UV-A led 20 ea, TiO2 8 ea): Sterilize and deodorize the air flow for up to 6 times; UV-C lamps: Enhancing the sterilizing effects, and the pathogenic microorganisms cannot escape from this path; Deodorization: Create a comfortable environment by eliminating the unbearable odors.