This USB powered ionizer emits healthy negative ions into the air which will attach themselves to air molecules and any impure particles in the air and negatively charge themThe emitted negative ions purify the air and remove toxic substances including dust particles, odors and molds,etcNegative ions can also eliminate static, reduce EMI and help boost your energy and mood Simply plug it into any USB port and the ionic air purifier will start working immediately without the hassle of batteries or power cordsUnit has a green LED to indicate that the unit is on and functioningNew USB Ionic Air PurifierColor: Black and WhiteDimensions: 3.5 inch x 0.80 inch x 0.75 inchMaterial: PlasticIncludes:3 x USB Computer Ionic Fresh Ozone Air PurifierOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.