Characteristic: 1. Shell: high-strength ABS casing; 2. Negative ions: 6X106pcs/cm3; 3. Filtration system: four layers of filtration (Pre-cotton, activated carbon, photocatalyst, HEPA); 4. In and out of the wind: top air inlet, side air outlet; 5. Medical grade UV germicidal lamp; 6. Reserve aromatherapy tank at the bottom; 7. Power on automatically, two speeds; 8. Can be used in desktop or car with different power; 9. Equipped with anti-slip strips or metal hangers + straps.