Holmes Small Room 3-Speed HEPA Air Purifier with Quiet Operation, White HEPA-TYPE FILTRATION: Filter helps remove up to 99% of dust, smoke, pollen, odors, mold spores, and pet dander, filtering particles as small as 2 microns to help provide cleaner air for your home or office; use any Holmes Aer1 Series Filters including Total Air, Allergen Remover, Odor Eliminator, and Smoke Grabber CONVENIENT FEATURES: Choose from 3 cleaning speeds to keep air fresh and pure: Select a lower speed while you're home for continued purification with less ambient noise, and a higher speed for powerful air purification while you're out DUAL POSITIONING AND COMPACT DESIGN: This compact air purifier can be placed vertically or horizontally anywhere, including a table or desktop; it's recommended for rooms up to 100 square feet or 10' x 11' OPTIONAL IONIZER: The optional ionizer naturally improves the performance of the air purifier while freshening the air 3-YEAR LIMITED WARRANTY: This product comes with a 3-year limited warranty from Holmes