Sensor of air cleaning monitor will change the speed automatically according to the air quality. Multiple filtration: prefilter, activated carbon, HEPA. TiO2 photocatalyst filters is can continually decompose the deleterious gas. UV lamp for sterilization and disinfecting. Negative ion generator refreshes indoors air. Mobile in use and time setting. Suitable area:20--30m2 Parameter Voltage 220 V Frequency 60/50HZ Power 70W Weight 12kg Air delivery 400m3/h Noise 50dB Dust purifying rate 99% Formaldehyde purifying rate 98% Benz purifying rate 99.8% UV sterilization rate 99%