The usb desk fan is powered via USB directly and can also be powered by the 18650 rechargeable battery.
Rechargeable batteries make the mini fan suitable for anywhere indoors and outdoors in summer;
With this clip on fan, you can be free to turn down or turn up air volume with the stepless speed technology, and it can use one battery or two but the work time will be different; The battery can supply electricity for 3 to 10 hours According to different wind speed.
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