The USB fan come with a USB charging cable. It can be charged via USB charger,laptop,power bank,car power bank and other USB -enabled devices.
The highly effective speed fan enables you to select your required air-flow, supplying you with the best possible cool temperature.
This fan can carry.you can use this fan, hold it on your hand, put it on the table.
Small size for easy carrying, 
USB charging is available for five hours at a time, 
Foldable. Can only be loaded with a sun umbrella above, so you can free up one hand     
Charging voltage: 5V     
Charging current: 1A     
Working voltage: 3.7V     
Battery capacity: 1200mAh     
Working time: 1-5h     
Wind: third gear