USB plug air oxygen bar  is a efficient tool which can help reduce radiation and have a good atmosphere you can work,via we improve our products. The instructions is listed here: 1.Activate cells and prevent against radiation. 
 2. Anion can dispel dust, smoke, so that fresh air and put an end to passive smoking.
 3.Prevent dust accumulation and protect your computer (Dust is the No. 1 killer of a computer damaged). 
 4.Ozone disinfection can be carried out on the air, inhibit bacteria viruses (such as H1N1) breeding. 
 5. Ozone can dispel musty, smoke, toilets smell and leather, paints release of formaldehyde, benzene and other toxic gases. 
  6.Rotate protective cover and plug directly into a computer's USB jack when in use. It’s very convenient. 
  7.When not in use, users can turn protective cover easily to protect the USB plug. 
  8.Blue light as decoration, warm and fashionable. 
  9.Exquisite, high quality goods acting as an excellent gift. Technical data: Product model: JO-728
Electrical source:5V / DC (USB plug)/
                     12V / DC (Optionally equip with cigarette point to switch USB)
Consumption power:≤ 1 WConcentration of negative ion: 3000000 pcs/cm3   it  used in computer and is convenient.     It is necessary for us who like surfing the internet,you can read carefullly .