USB Rechargeable: With a built-in 4000mAh high-capacity lithium battery, this portable fan can run for 5.5 to 13 hours on a full charge. It is compatible with all USB ports. Five-Speed Wind Speed One-Button Design: Compared to similar products on the market, this small fan features an innovative five-speed wind control to meet your needs in various situations. The one-button design allows you to switch between different wind speeds with a single press and turn it off by pressing and holding the button for three seconds. LED Display: The fan has a digital display that shows the wind speed and current battery level during operation. In addition, the small fan's battery level indicator can also remind you to recharge it before it runs out of power. Fast Cooling and Removable Fan Cover: The USB fan has five blades to maximize airflow for a cooler, gentler breeze. Furthermore, the removable fan cover allows for easy cleaning, preventing dust buildup that can trigger allergies. LOW NOISE AND PORTABLE: The high-quality pure copper motor reduces friction noise and delivers a strong breeze with a lower noise level. Weighing only 190g, this portable fan can be taken anytime, anywhere. You can use it as a handheld fan, a neck fan, simply hang it around your neck when you're outdoors, or as a desk fan while you work.