Powered by upgraded rechargeable polymer, which can the fan run longer than the same capacity regular, that compatible for w / any USB port The 3 selectable speeds provide you more options in different temperature environment small-shaped yet powerful, blows out natural cool wind and cools you down fast Excellent for indoor and outdoor use, the personal fan can produce natural wind to keep you cool when reading, doing sports, waiting in line and travelling, it would be your best chioce The whole body of this compact fan boasts a sophisticated and stylish space-saving design, which makes it more portable for use and storage Built-in copper brushless motor, the personal fan makes low (below 36 decibel) even at high speed It won ’ for t disturb at all while you are working or, for ideal for desktop