2 Stage Filtration: Filter 99.97% of particles as small as 0.3 microns with the carbon activated pre-filter and True HEPA filter. 3 Fan Speeds: Turn the control knob to find your optimal fan settings with low, medium, and high options. Ideal for Your Space: Fits perfectly on any nightstand, desk or end table while blending in seamlessly with your decor. Sinus and Cold Relief: Help reduce harmful airborne germs and other irritants that cause swelling and affect breathing.