Power Supply Methods & Simply connection the USB cable to the devices that usb port Besides, The portable air fan operates at a low energy consumption, much cheaper than running a air conditioners Wonderful gift, sweet warm friend family and yourself Adjustable Wind Speeds and Timing 5wind speeds can be adjusted, manual up-down to adjust blowing direction to meet your different needs.adjustable timing you can choose the most suitable to enjoy your leisure time, or working time Handle DESIGN Portable handle, you can easily carry it out, very suitable for homes, offices, outdoor picnics, and so on Personals Air coolers & Air Humidifier It is not only an personals air coolers, but also an air humidifier You can use the small evaporative air coolers all year round, cooling you in hot summers and humidifying the air in dry autumn and winter, Manufacturer: ljhnba