... 4.Low-power. USB personal air Purifier EP201 -dispel dust, smoke, inhibit bacterial viruses breeding SpecificationsParametersProduct Size91*27*14 mmRated ... ionic breeze technology, produce a steady stream of high concentration of negative oxygen ions and a small amount of active ... Negative oxygen ions is not only able to remove smoke dust, to sterilize and inhibit mildew, to promote metabolism, enhance ...