This product adopts advanced carbonized fiber technology . It cleans polluted air , such as dust , smoke and remove odors by producing a lot of Anion .It also can freshen the air , even make natural air . Kill bacteria and eliminates odors by the strong oxidization feature of active oxygen . Breathe the fresh and healthy air away 30 cm with it whereverin the office , dining-hall , subway , station , cinema , and so on . It can be hanged on the neck and carried in the pocket at an time and any where. It help to know the newfangled guide with FM radio and remove the loneness and the tire in the trip .