1.USB charging: With two built-in 4200mAh high-performance lithium batteries, the USB charging fan can work for 6-13 hours after being fully charged. This mini fan is compatible with all USB ports, so you can charge it with any USB device2.Five-speed adjustable and one-button design: The small fan is innovatively upgraded to five wind speeds to meet your needs in different occasions. In addition, with a one-button design, you can switch between different wind speeds by pressing the button, and long press the button for 3 seconds to turn it off3.LED power indicator: The folding fan is equipped with a clear digital LED display that displays the accurate battery level and current wind speed while working. As a low-battery reminder, remind you to charge this portable fan in time4.Quick cooling and detachable fan cover: The USB fan adopts a 5-blade design to maximize airflow for a cooler and softer wind. In addition, the detachable fan cover ensures that you can easily clean the fan to prevent allergies caused by dust accumulation. 5.Low noise and portable: The high-quality pure copper motor effectively reduces friction noise, providing strong wind while reducing noise. This rechargeable USB fan weighs only 190 grams and can be easily carried anywhere anytime.