About this article USB Rechargeable: With two built-in high-performance 4400mAh lithium batteries, the USB rechargeable fan can work for 6-13 hours when fully charged. This mini fan is compatible with all USB ports, so you can charge it via any USB device. 【Adjustable five speeds and one button design】Compared with similar products on the market, the small fan has been innovatively improved to five wind speeds to meet your needs on different occasions. In addition, you can use the one-button design to switch different wind speeds by pressing the button and turn them off by long-pressing the button for 3 seconds. 【LED power display】The folding fan is equipped with a clear digital LED display that shows the exact battery level and current wind speed during work. It acts as a low battery reminder so you remember to charge this portable fan in time. 【Fast cooling and removable fan cover】The USB fan has a 5-wing design that maximizes airflow for cooler and smoother wind. In addition, the removable fan cover ensures that you can easily clean the fan to prevent allergies from dust accumulation. 【Quiet and Portable】High-quality pure copper motor effectively reduces noise caused by friction and provides strong wind with lower noise. The rechargeable USB fan weighs only 190g and can be easily carried anytime, anywhere.