... remove pollens, smoke, pet dander and other particles. NAME:mini usb air purifierFeatureHigh density negative ions attract airborne allergens like pollens,smoke ... fashion designQuite operation lets you enjoy the benefit of this purifier even when youre workingLow power consumptionUSB plug-inNo filter,zero ... Ion density2.5*106 pcs/cm3Ozone density<0.05 ppm USB air purifier,USB air cleaner, USB gift,gift