Handheld Fan Next-Gen Airflow: Up to 40h Runtime, Metal Body - Enduring Quality\n\n-- Brushless Motor - Super Power: The combination of a three-phase brushless motor and a 5000mAh battery significantly improves the wind speed, power, and endurance. The maximum wind speed can reach 9m/s. The highest rotation speed of the handheld fan is about twice that of a regular personal fan, reaching up to 9700 RPM. It can cool for 3.5-40 hours on a single charge\n-- Scroll Switch - Customizable Wind Speed: This small fan adopts a scroll switch design, and the wind speed can be adjusted steplessly. The portable fan can customize speeds from 1 to 100, meeting your various wind power needs in any scene.\n-- Fashionable Design - Metal Body: The body of this handheld fan is made with advanced oxidation technology, giving it a metal-like texture. Its smooth cylindrical design provides a comfortable and cool feeling. This handheld fan is not only a comfortable tool, but also a sophisticated and fashio.