1. Small size, can be carried with you. No need to replace consumables 2. Silent operation, suitable for use in multiple scenarios 3. Adjustable gears, switch according to different environments 4. Energy saving and high efficiency, it can run for about 40 hours on a single charge 5. Environmental protection without consumables Product category: Air Purifier Function: In addition to formaldehyde Power supply: USB Rated frequency: 50 (HZ) Use environment: home Control method: push-button Application area: 11㎡ (inclusive) -20㎡ (inclusive) Filter type: none Working principle: negative ion size:80*35*23mm Material:ABS colour:white Package Contents: 1 * Air Purifier 1 * Charging cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.