SODIAL USB ionic Oxygen Bar Freshener Air Purifier ionizer For Laptop Black+White 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 them The emitted negative ions purify the air and remove toxic substances including dust particles, odors and molds,etc Negative 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 cords Unit has a green LED to indicate that the unit is on and functioning