Extremely Powerful Wind: high-efficient DC motor and 3600mAh battery improves the wind speed, power, and endurance. The highest rotation speed of the handheld fan is three times that of a regular personal fan, reaching up to 19000 RPM. It can cool for 3.2-12 hours on a single charge. Easy on the go use: This portable handheld fan is incredibly compact and lightweight, weighing even less and being smaller than a typical mobile phone. You can easily throw the mini fan in your pocket or tote bag to take it anywhere. 0-100 Speed: You can customize wind speed that can be adjusted steplessly. The portable fan can customize speeds from 1 to 100, meeting your various wind power needs in any scene. Smart Digital Display: The rechargeable mini fan is equipped with a smart digital screen that conveniently shows the remaining battery life and speed level. This user-friendly feature allows you to effortlessly adjust the fan to ideal wind speed and stay informed about when it's time to recharge. Convenient Charging：The Rechargeable Battery fan is compatible with regular USB ports, laptops, portable power banks and car chargers, so you can easily get a seamless charging experience.