USB Power supply: This fan is a rechargeable model with USB port. It can also be powered directly by the battery, but the insulation of the battery compartment must be removed, otherwise it cannot be charged or used. USB cable can charge computers, mobile power supplies, mobile treasure, etc. 3 Adjustable speed level: low/medium/high speed. Press the power button repeatedly to adjust the fan speed. Portable and light design: it can be carried with you when you go out, especially for summer travel or outdoor sports, you can carry it with you. Work for 2-4 hours on full charge. Practical and user-friendly handle design.