This fan has several great features. First of all, it adopts USB charging method, which is convenient, safe and convenient, and there is no need to worry about the problem of insufficient power. Its 400mAh battery allows you to enjoy up to 1-3 hours of use, even outdoors. Secondly, the fan has 3-speed adjustable wind power, which can be adjusted freely according to your needs, ranging from gentle breeze to strong coolness. Fan type: small fan Fan classification: USB fan Power mode: USB Input and output: 5V-1A/3.7V Wind speed gear: 3 gears Shaking way: 8-character shaking head Blade diameter: 14*9.5*6.5cm Function: Multi-level adjustment Package Included:1 * USB fan