1. Powerful Motor and long endurance A three‑phase brushless motor paired with a 4000mAh battery delivers strong wind with reliable run time. Max wind speed reaches 9 m/s for effective cooling in hot conditions or windy environments. 2. Fast charging and USB compatibility Supports 18W fast charging and fully recharges in about 1.5 hours. On a full charge, you can expect up to 16 hours of use. It can be powered by USB sources such as power banks, computers, laptops, or USB chargers. 3. Stepless, precise speed control Stepless wind speed control allows smooth adjustment from 1 to 100. Five quick-access speed presets provide easy selection, while the latest brushless motor enables efficient 360-degree air intake for steady airflow. 4. LED display and battery alert High-definition digital display shows current wind speed and remaining battery. A low-battery indication helps you plan charging before you head out so you always have a cooling companion when needed. Use scenarios - At home or in the office: steady personal cooling during long work sessions or heatwaves. - Outdoors: camping, hiking, or travel where USB charging is convenient and portable power is available. - Commute or on the go: compact and easy to carry, quick recharge ensures you stay comfortable during errands or travel.