USB RechargeableWith built-in 3000mAh high capacity lithium batteries, the portable fan can work for 5 5-12 hours when fully charged You can charge this battery-powered mini fan with any USB device since it is compatible with all USB ports Five adjustable speeds one-button designCompared to similar products on the market, the small fan has been innovatively upgraded to five wind speeds to meet your needs in different occasions Besides, the one-button design allows you to switch between wind speeds by pressing the button turn it off by pressing the button for three seconds Display LEDThe fan comes with a digital display that shows the current wind speed battery level when it is working Besides, the small fan's battery level indicator also serves as a reminder to recharge it before this mini fan runs out of power Fast cooling removable fan protectionThe USB fan features five blades that maximize airflow for cooler, smoother wind In addition, the removable fan guard allows you to easily clean it to avoid allergies due to dust accumulation Low noise portableHigh quality pure copper motor reduces friction noise provides powerful wind at a lower noise level With a weight of only 190 grams, the h fan can be taken anywhere anytime You can use it as a h-held fan, a neck fan by simply hanging it around your neck when you are outdoors, or as a desk fan when you are working