Product instruction: IonCare is a USB-powered ionizer that uses a carbon fiber brush system to emit healthy negative ions into the air By attaching themselves to air molecules and any impure particles in the air and negatively charge them The emitted negative ions extremely purify the air and remove toxic substances including the dust, odors and molds Features: Can be put directly into a computer USB port Consistently releases negative ions Highly effective in removing odors and dust Attracts airborne allergens like pollen, smoke, pet dander and other small particles Eliminates static and reduces EMI Helps boost your energy and mood Unique design of the rotatable cover well protects USB lead Soothing blue LED light indicates the working of the unit USB extension cable included With additional USB car adapter for car use Technical specifications: Density of anion: 1 million/cm3 Effective range: about 1m2 Rating voltage: 5V DC Power consumption: 0.3W Dimensions: 89.5 x 21.5 x 21.5mm Weight: 22g