Features:

Built-in a rechargeable 4000mAh li-ion battery, can work for 6-24 hours after fully charged.
This mini fan has 4 speed levels(Low/medium/high/sleep mode), can adjust by pressing the power button repeatedly.
This fan can fold up to 180°, and rotate 360°, so you can use it by different ways: hold it on the hand; put it on the desk or clip it on other objects.
Convenient charging, compatible with all USB output devices, such as computers, laptop, power bank and so on.
Portable lightweight design, perfect for indoor and outdoor use, especially in summer.
Powerful copper motor, seven fan blades, strong wind, super quiet.
The sleep mode can avoid headaches, stuffy nose caused by prolonged strong wind and meet the physiological needs of people, which is really suitable for babies and kids.

Specifications:

Material: ABS Plastic + Electronic component + Silica gel
Battery type: Rechargeable 2170 Li-ion battery 4000mAh
Speed levels: Low/medium/high/sleep mode
Charging time: About 4-5 hours
Output power: 3.76W (MAX)
Working time:Speed 1 last 20-24 hour; Speed 2 last 10-15 hours; Speed 3 last 6-8 hours; Speed 4 last 13-18 hours
Any level can be turned off by long pressing for 5 seconds

Package includes:

Portable Handheld Fan USB Rechargeable Mini Desk Fans Foldable Rotatable Clip On USB Fan Portable Handheld Fan USB Rechargeable Mini Desk Fans Foldable Rotatable Clip On USB Fan