1. [Powerful Motor-Turbine] The combination of a three-phase brushless motor and a 4000mAh battery significantly improves wind speed, power and endurance, with a maximum wind speed of up to 9m/s. 2. [Multiple Charging Methods-Fast Charging] This USB charging fan supports an 18W fast charging plug, which can be fully charged in just 1.5 hours, and provides 16 hours of battery life when charging. This handheld portable fan can be powered by USB devices such as mobile power banks, computers, laptops and USB chargers. 3. [Stepless switch-customizable wind speed]This small fan adopts a stepless design, the wind speed can be adjusted steplessly, and the portable fan can customize the speed from 1 to 100. This handheld mini fan adopts the latest powerful brushless motor, which can absorb wind power 360° and perfectly utilize the fluidity of the air. Simply press the stepless button to switch between 5 speeds. This small fan can meet your various wind power needs in any scene. 4. [LED smart display-battery wind speed reminder]This travel portable fan is equipped with a high-definition digital display that displays the current wind speed and remaining power, so you never have to worry about the remaining power of the fan. When the battery of this mini fan is low, you can arrange charging in advance to ensure that you have a cool companion every time you go out.