Feature Optional mode: negative ionizer with the red indicator on or Ultraviolet LED with the blue indicator on. HEPA filter,99.97% effective in removing smoke, dust , and other airborne particles. Active carbon filter, effective in removing odor and smell. Washable pre-filter. Negative ionizer. Photo-catalytic oxidation technology(Ultraviolet LED with TiO2 Mesh). Powerful and low sound operation. Mighty purifying efficiency makes it idea for living room, hall , or enjoy the benefits of a silent air purifier in the office, conference room, bar or public place. Energy efficient/ low power consumption. The filter can be changed as your request, the replacement include non-woven filter, fluoric filter, pre-filter and so on. And the negative ions can be replaced by plasma or O3 . please feel free to contact us for details. Specification Coverage 25m2 Voltage/power 100-250V/50-60Hz / <9W Filtration Efficiency 99.97% Negative Ion density >3.0*106pcs/cm3 Ozone density <0.05ppm Color White /black/blue/ yellow Net/Gross weight(g) 1060/1640 Product size/packing size(mm) 240*240*218/280*300*240 Master Carton size(cm) 57.5*31.5*49.5 (4pcs/CTN)