This highly effective three-stage filtration unit captures submicron particles (dust, pollen, smoke, etc.), removes odors and absorbs gases and fumes while completely recycling the air in your automobile every six minutes. Mounts safely behind the seat and takes up no passenger space. Small and compact, it is also ideal for indoor use in hotel rooms, home or office. Comes complete with cigarette lighter adapter. Weighs 2 lbs., 3.5" H x 8" D. Five-year factory warranty.