USB rechargeableWith two built-in high-performance lithium batteries with 4400 mAh the USB rechargeable fan can work for 6-13 hours when fully charged. This mini fan is compatible with any USB port, so you can charge it through any USB device. Adjustable Five Speed & One Button DesignCompared 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 turning them off by long pressing the button for 3 seconds. LED power displayThe folding fan is equipped with a clear digital LED display, showing the exact battery level and the current wind speed during work. It serves as a low battery reminder so that you remember to charge this portable fan in time. Fast Cooling & Removable Fan CoverThe USB fan features 5 wings design that maximizes airflow for cooler and softer wind. In addition, the removable fan cover ensures that you can easily clean the fan to prevent allergies from dust collection. Quiet and portableHigh-quality pure copper motor effectively reduce noise caused by friction, and provide strong wind with lower noise. The USB rechargeable fan weighs only 190 grams and can be easily taken anytime, anywhere.