USB Charging: The portable fan has a built-in high-capacity 3000mAh lithium battery, which can work for 7-12 hours after being fully charged. You can use any USB device to charge this mini battery powered fan as it is compatible with all USB ports. Five-speed adjustable one-button design: Compared with similar products on the market, the small fan is innovatively upgraded to five-speed wind speeds to meet your needs in different occasions. Additionally, the one-touch design allows you to switch between different wind speeds by pressing the button and turn it off by pressing the button for three seconds. LED Display: The fan is equipped with a digital display that displays the current wind speed and battery level during operation. In addition, the mini fan's battery indicator light can also remind you to charge before the mini fan is powered on. Quick Cooling & Removable Fan Cover: The USB fan has five blades to maximize airflow for cooler, smoother wind. Additionally, the removable fan cover allows you to easily clean the fan and avoid dust buildup that can cause allergies. Low Noise, Portable: High-quality pure copper motor reduces friction noise and provides strong wind with lower noise level. The handheld fan weighs only 190 grams and can be carried anywhere and anytime. You can hang it around your neck and use it as a hand fan, neck fan when you go out, or use it as a table fan while working.