USB oxygen bar 1oxygen bar : Large amount ions 2remove smoke,clean air,reduce radiation 3CE, Fcc, RoHS 4patent Features: negative ion air purification function, effectively remove the air of smoke, dust, allergens, so that more fresh air; unique way the computer USB power supply, convenient and practical; compact and beautifully easy carrying. 1. Anions can eliminate the car / indoor air of dust, ...