【Long-lasting working time】Built-in 10000mAh rechargeable battery, it can run continuously at low speed for up to 40 hours according to wind speed and light mode, and it takes 4-5 hours to fully charge. Our portable waist clip fan can be used while charging. The built-in 5V-3A type C input and 5V-2A USB output make it easy to charge cordless fans for long-lasting cooling anytime, anywhere 【5 levels of strong wind regulation】This electric USB fan has a high-speed brushless motor with a maximum speed of 16000RPM, blowing out a strong airflow of up to 18mf/s for instant cooling. With 5 gears and adjustable wind speed from natural to strong, it can be set to various modes according to your needs when using. The maximum wind speed lasts for 8 hours, while the minimum wind speed can last up to 40 hours. Ideal for workers who need to withstand strong winds in hot environments 【5-in-1 Multi-function Waist Clip Fan】Integrated Waist Clip Fan, Desktop Fan and Neck Fan. You can clip this belt fan to your shirt, belt, or pants, or you can use a lanyard to hang your personal fan around your neck. Using the bracket on the fan clip, you can place this USB fan on your desktop. It can be used as an emergency power bank to charge your phone directly and never worry about running out of your phone battery again. 【With silicone case, non-slip and anti-drop】Our mini portable waist fan is designed for various outdoor use scenarios and is suitable for occupations such as workers and farmers. It comes with a high-quality protective silicone leather case that prevents shock in the event of a drop and ensures that the body fan is completely undamaged. The upgraded manganese steel clamp provides a stronger grip and keeps the wearable fan firm and more durable at all times. The practical design of the two clips facing opposite directions allows for more placement options 【Flexible Charging, Small Size】This undershirt fan can be quickly charged with USB chargers, laptops, computers, car chargers, and other USB-enabled devices, making it the perfect choice for home, office, desktop, travel, outdoor, car, and camping. Since the compact size of this cooling fan is only 330 grams, you can take this little fan anywhere you want. Not only can it be used indoors, but it also brings a cool feel to your outdoor activities like yard work, fishing, hiking, camping, and traveling