These tiny USB-powered anion air purifiers are virtually the same size as a USB flash drive, but pack a lot of air purification power. They produce an anion density of 1 million parts per cubic meter, neutralizing airborne particles like dust, molds, pollen, and removing unpleasant odors. Users just plug these items into their PCs and they work automatically. - USB-powered ionizer air purifier - Carbon fiber brush system to emit anion particles - Removes toxic substances including the dust, odors and molds - Absorbs airborne allergens like pollen, smoke, pet dander and other small particles - Eliminates static and reduces EMI - Unique design with rotating cover - Green-LED power indicator - Anion density: 1 million/cm3 - Power consumption: Less Than 0.3W - Power by USB: DC 5V - Weight: 22g - Dimensions: 89.5 x 21.5 x 21mm