... USB charger,and car charger air purifier, air fresher, air cleaner, oxygen generator, negative ion generator* Main material: plastic ABS* ... Available to be powered by 3 AAA batteries * Generate negative ion, Ozone and aroma Dispel fatigue, maintain mental clarity ... smell, smoke smell, formaldehyde, benezene and poisonous gas * Negative ion consistency: 3*106PCS/M3 * Healthy aroma highly compressed ...