Voltage: 220V/50Hz Power: 37-50W weight: 3.34kg Noise: 31dB Anion Density: 1*106pcs/cm3 Ozone density: 160 m3/h Size: 420*310*121mm Area: 50 m2 Usage: household, office Package: 4pcs/carton Functions: 1. Pre-filter: Collect all kinds of dusts as below floating mildew, fungus, virus, fir pollen smoke (CO), pet dander and pollen 2. Strongly HEPA filter: concentratedly and effectively filter many kinds of mote in air and can clearly die off the suspended grain to the 0.3 micron 3. Highly-efficient active carbon filter: completely decompose harmful volatile organic compounds inside the house, such as formaldehyde, ammonia, benzene, TVOC, deodorize unpleasant smells of cigarette smoke, alcohol and food. 4. Anti-bacteria filter: effectively kill suspended bacteria and viruses, and protect passengers from cross infection. 5. Release negative ion: Clean up 99.9% pollen and particles