Portable Mini iFresh Personal Ionic Air Purifier Necklace Ionizer USB Rechargeable (Blue) iFresh anion generator uses the latest scientific and technological achievements that generates high pressure with the thinnest, smallest of the piezoelectric ceramic voltage transformer and other components, ionize air in the machine and generates about 50,000 pcs/cm3 of anion. It emits anion fresh air curtain from 30cm like a mask, protect human, especially elderly, children, women, sick, disabled from dust, pollen, viruses, bacteria, mites and others. It hangs around your neck and is compact in size with weigh only 40 grams. There is no noise, no electromagnetic radiation, and no filters to change and its ready to go whenever you are, on the plane, in taxis, in bus, to the gym, crowded elevators, in office, or anyplace you need. Package includes : 1 x Personal air purifier, 1 x USB charge cable, 1 x Instruction sheet, Gift box packaging.