Batteries in a Portable World: A Handbook on Rechargeable Batteries for Non-Engineers, Fourth Edition

?Long Working Hours?20000mAh large capacity battery. When fully charged, it can work for 200 hours in low-speed mode. You can monitor the remaining power according to the indicator light.

?Emergency Power?When you encounter a power outage or emergency, this personal fan can act as your mobile power supply. With a USB interface, you can charge the phone or use an emergency light source. Very suitable for outdoor camping.

?Shutdown Timer?When you need cool breeze to help you fall asleep. You can use the timer function of the desk fan. Set to turn off after 2 hours/4 hours. Avoid catching cold when you fall asleep.

?3 Speeds?This desktop fan can be set to 3 wind speeds. Low wind speed can reach 2.4m/s, high wind speed can reach 4.5m/s strong wind. The fan can rotate vertically at 350°. Working time is 15-200 hours.

?Elaborate Design?It’s not just a desktop fan. It also has the function of mobile power. It measures 9.4 x7.1×2.8 inches and weighs 1.56 pounds. Comes with a handle for outdoor use.

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