Enhanced Air Purification: Double-Sided Air Inlets, 2 H13 True HEPA Filters. 3-stage filtration system combines of pre-filter, HEPA filter, and activated carbon filter can remove 99.9% of particles with minimum size of 0.1 microns in the air, such as smoke, pet dander etc, effectively improve air quality of your home. Maximum Speed Button: Press the Max Speed Mode button, the HEPA air purifier will run at full load, and clean air with the fastest speed. You can also adjust the 4 wind speeds from 'Sleep' to '1, 2, 3'. Timer setting from 1 to 8 hours, tailor air purification to fit your schedule. Aromatherapy & Quiet Sleep Mode: Enhance your air purifier with aromatherapy. Add your favorite essential oils for a refreshing and calming atmosphere. Operates quietly for peaceful environments. Sleep mode stays under 25 dB for a serene night.