Wein VI-3500 High-Density Ionic Air Purifier Complete elimination of dust, cigarette smoke, pet dander, pollen, mold spores, viruses, and bacteriaover 98% in only the first hour of use Silently sanitizes the air in a very large room or small apartment (600-800 SF) Ion output: 450 trillion ions/sec; uses less than 6 watts of power; virtually no ozone (0.04 ppm) Built-in detector continually monitors ion production levels; status light tells you the ionizer is working; no filters to change (just wipe collector pad with a damp cloth) Manufactured and developed by Wein Products, the leader since 1964 in environmental pollution control systems for air, water and food safety