1. USB personal air purifier; 2.Remove smoke,dust and bacteria; 3.Bring you clean,fresh,natural air; ... 4.Low-power. USB personal air Purifier EP201 -dispel dust, smoke, inhibit bacterial viruses breeding SpecificationsParametersProduct Size91*27*14 mmRated VoltageDC ... air;Negative oxygen ions is not only able to remove smoke dust, to sterilize and inhibit mildew, to promote metabolism, enhance ...