USB Rechargeable With its built-in high capacity 4200mAh lithium battery, the portable fan can operate for 5.5 to 13 hours when fully charged. It can be charged using any standard USB power source, making it compatible with various USB ports. Five Speeds Adjustable and One-button Design This fan features five adjustable wind speeds, offering enhanced flexibility for different environments and user preferences. The one-button control allows easy switching between speed settings. Press and hold the button for three seconds to turn the device off. LED Display The fan includes a digital display that shows the current wind speed and remaining battery level during operation. The battery indicator helps remind users to recharge before power runs out. Quick Cooling and Removable Fan Guard Equipped with five blades, the fan delivers strong, smooth airflow for effective cooling. The removable fan guard simplifies cleaning and helps reduce dust buildup, supporting better hygiene. Low Noise and Portable A high-quality pure copper motor ensures powerful airflow with minimal noise. Weighing only 190 grams, the fan is lightweight and easy to carry. It can be used as a handheld fan, worn around the neck for hands-free convenience, or placed on a desk for personal cooling during work or study.