Uses ozone and negative ionization, nature"s most powerful deodorizers against airborne bacteria, viruses, pet odor, cigarette smoke, unwanted odors, mold, mildew, and fungus * Coverage: 150 sq. ft * No maintenance required, no batteries to replace, no filters to clean or replace * Compact and portable. Perfect travel companion * Elegant and modern, suitable to fit any decor. Can be used as a night light