New in box EASY to USE: Mooncity OZ100 car air purifier is small in size and compact in design, just attach the included clip to your car's air vent, plug the charger into the cigarette lighter sockets to work. HEALTH BENEFITS: Kill bacteria/germ/virus and eliminate the odors, dust, cigar smoke and pungent odor, restrain growing of germ. EFFICIENT &QUIET: Efficient Car air freshener to Sterilize bacteria and remove cigar smoke and pungent odor, restrain growing of germ. It is so quiet that you can hardly hear any noise while it is working. SAFE &RISK-FREE: Ozone output is less than 0.05ppm over 8 hours, which is safe to human body and environment, but it helps to breaths the best air possible, even in heavy downtown traffic.