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 New USB Ionic Air Purifier Color: Black and White Dimensions: 3.5" x .80" x .75" Material: Plastic Includes: 1 x USB Computer Ionic Fresh Ozone Air Purifier Note:Light shooting 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 +/-1-3 cm. Price includes free shipping to the USA in about 30-50 days with no tracking available. One order has been delivered in less than 30 days to the USA. Shipping to other countries available too but price/delivery time can differ. Listed price is a discounted price now.