Apollo23-Silent USB Air Purifier, Desktop and Laptop PC Ioniser, Air Freshener and Ionic Atmosphere Enhancer USB-powered Air Ionizer Silent Ionic Fresh Ozone Purifier Plug and play, no driver needed; convenient and practical Anion air purification function, effectively remove the air of smoke Input Power: DC 5V (USB Power). Dimensions: 3 3/8" x 3/4" x 0.87"