Feature: 1. Ozone + anion dual mode, anion for purification. 2. Eliminate formaldehyde and ordor by circulation. 3. Ergonomic design, small and portable. 4. Silent work, no influence for night sleeping. 5. Built-in 2000mAh cell, long service life. 6. Filter interior air of car and home. Specification: The air filter is ozone + anion dual mode to get more fresh air. It is small and portable, practical for home and car to bring you more healthy life. Features: Ozone + anion dual mode, anion for purification. Eliminate formaldehyde and ordor by circulation. Ergonomic design, small and portable. Silent work, no influence for night sleeping. Built-in 2000mAh cell, long service life. Filter interior air of car and home. Specifications: Material: Anodized alloy + ABS Color: Grey, Silver, Black (optional) Voltage: 5V Cell: 2000mA Continuous Time: 4h Item Size: 159.93 * 55.65 * 46.36mm / 6.3 * 2.19 * 1.83in Package Weight: 250g / 8.82ounces Package Size: 165 * 60 * 50mm / 6.5 * 2.36 * 1.97in Packing List: 1 * Air Filter 1 * USB Cable Package List: 1 * Air Filter 1 * USB Cable