【USB Rechargeable】With built-in 4200mAh high-capacity lithium batteries, the portable fan can work for 5.5 to 13 hours when fully charged. You can charge this battery-powered mini fan with any USB device as it is compatible with all USB ports. 【Five Adjustable Speeds & One-Button Design】Compared with 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 Display】The fan comes with a digital display that shows the current wind speed and battery level when it is running. Moreover, the battery level indicator on the small fan also serves as a reminder to charge it before this mini fan runs out of power. 【Fast Cooling & Detachable Fan Cover】The USB fan has five blades that maximize airflow for cooler and softer wind. In addition, the detachable fan cover allows you to easily clean it to avoid allergies due to dust accumulation. 【Low Noise & Portable】The high-quality pure copper motor reduces friction noise and provides powerful wind at a lower noise level. Weighing only 190 grams, the handheld fan can be taken anywhere and anytime. You can use it as a handheld fan, a neck fan by simply hanging it around your neck when outdoors, or as a desk fan when working.