About this item USB RechargeableBuilt-in 4200mAh high capacity lithium batteries, the portable fan can work for 5.5-13 hours when fully charged. You can charge this battery operated mini fan with any USB device as it is compatible with all USB ports. Five Adjustable Speeds and One Button DesignCompared to similar products on the market, the small fan has been innovatively upgraded to five wind speeds to meet your needs on different occasions. In addition, the one-button design allows you to switch between wind speeds by pressing the button and turn it off by pressing the button for three seconds. LED displayThe fan is Comes with a digital display that shows current wind speed, wind and battery level when it is working. Moreover, the battery level indicator of the small fan also serves as a reminder to recharge before this mini fan runs out of power. Fast cooling and removable fan protectionThe fan USB features five blades that maximize airflow for cooler, smoother wind. In addition, the removable fan guard allows you to clean it easily to avoid allergies due to dust accumulation. Low noise and portableHigh quality pure copper motor reduces noise of friction and provides powerful wind at a lower noise level. Weighing just 190 grams, the hand fan can be taken anywhere, anytime. You can use it as a portable fan, a neck fan by simply hanging it around your neck when you're outdoors, or a desk fan when you're working.