... Purifier - Guard to you health. Introduction SY2083 portable air purifier uses the electronic theory to produce the negative ... gastritis, upper respiratory tract infammation, bronchial asthma,atrophic rhinitis, stomatitis* Portable, easy to carry. Adaptation range *Trains, airplanes, ships, cars*Schools ... .*Turn the power of the machine off when not in use. Portable Negative ion Air Purifier(SY2083)