Knox Gear KN-APUR Mini Plug in Air Purifier Sanitizer with Odor Reduction (Single Pack) Includes 1-Year Manufacturers Warranty / The Knox Air Purifier is quite simply the very best, most highly-successful and proven small space plug-in air purifier that you can buy. It puts you in control of the indoor air purification level by featuring an adjustable control knob that allows you to customize its purification power to whatever the current conditions may require, as often as you choose By generating activated oxygen (ozone) at safe, user-controlled levels (&lt;0.05 ppm) and negative ions (2 million/cubic cm/second), the Knox Air Purifier doesn't just disguise mold, mildew, E-coli, Candida, Listeria, Staph, Salmonella, Giardia, Legionella, and Cryptosporidium; it attacks and neutralizes them; kills E-coli more than 3,000 times faster than chlorine; safely and naturally kills germs lurking in tile grout, caulking, in crevices, around plumbing joints, under trash cans Quiet and attractive, the Knox Air Purifier consumes under 7 watts of energy, less than a tiny night-light bulb, and costs only pennies per month to operate, and its sleek, modern design makes it an attractive complement to any decor; the Purifier reduces the harmful effects of chemical cleaning products in your personal environment and in the world's wastewater systems, and it is virtually maintenance-free with no parts to wear out or filters to change--ever Designed to purify the air in areas up to 50 SF, the Knox Air Purifier is ideal for bathrooms, laundry rooms, office work stations, janitorial closets, trash areas, pet areas, and under or next to the kitchen sink-anywhere harmful bacteria may pose a problem Warranty provided by Knox Gear, one of the air and water purification industry's most respected leaders