The ionic air purifier works by emitting a positive charge into a room. Particles in the air likewise become positively charged. As air travels through the air purifier, allergens naturally gravitate and cling to the negatively-charged metal collection plates in the appliance. The air purifier features a grounded plug for use in grounded-style outlets. Energy efficient, the purifier allows users to choose between low, medium, and high power levels to best address a room’s size and allergen content without wasting energy. The air purifier works best in rooms up to 500 square feet in size. The purifier uses a LED display to indicate the selected power level. Another light indicates when the purifier requires cleaning. While many other air purifiers require the purchase of replacement filters, this model does not use filters. Users clean the purifier by wiping its collection plates clean with a rag according the cleaning directions outlined in the product manual. The purifier should be cleaned every four to five days. For user safety, the purifier should be turned off and then unplugged prior to cleaning. This item is intended for indoor use only and should be situated approximately 12 inches from the outlet. Do not use the purifier in bathrooms, near fireplaces, or in spaces with frequent exposure to flammable vapors. Ionic Pro offers a one-year warranty for this item. The air purifier measures 29 by 10-1/2 by 9 inches and weighs 10 pounds upon shipping. --Jessica Reuling