Long Lasting Working TimeBuilt-in 10000mAh rechargeable battery, which can be run continuously for up to 40 hours at low speed according to the air speed and light mode, and takes 4-5 hours to to fully charge. Our portable waist clip fan can be used when it's during charging. Built-in 5V-3A type C input and 5V-2A USB output, Which is convenient for charging the cordless fan, and it provides long-lasting cooling wherever you need it5 in 1 Multifunctional Waist Clip FanAn integrated waist clip fan, desk table fan, and neck fan. You can clip this belt fan to your shirts, belt, or pants, or you can hang the personal fan around your neck with the lanyard. With a bracket on the fan clip, you can put this USB fan on the desk. It can be used as an emergency power bank to directly charge a mobile phone, with no more fear of running out of phone battery. Built-in LED Light and SOS function, it not only provides long-term illumination but also helps you with outdoor activitiesWith Silicone Cover, Non-Slip and Anti-DropOur mini portable waist fan is designed for various outdoor usage scenarios, catering to occupations like workers and farmers. It comes with a high-quality protective silicone leather case which protects from shock when dropped and ensures the body fan is not damaged at all. The upgraded Manganese steel clamp provides stronger gripping force, always keeping the wearable fan firmly, and is more durable. Practical design with two clips facing opposite directions allows for more placement options5 Levels of Powerful Wind AdjustThis Electric USB fan has a high-speed brushless motor with a maximum speed of up to 16000RPM and blows at most 18mf/s strong airflow, cooling down in a second. With 5 gears and adjustable wind speeds from natural to strong, it can be set to various modes according to your needs when you are using it. The maximum wind speed persists for 8 hours, whereas the minimum wind speed can endure for as long as 40 hours. It is an ideal choice for workers who need the strong wind in high-temperature environmentsFlexible Charging and Compact SizeThis undershirt fan has fast charging support via USB chargers, laptops, computers, car chargers, and other USB-enabled devices, it is the perfect choice for home, office, desktop, travel, outdoor, car, and camping. Due to the compact size of this cooling fan which is only 290 grams, you can take this small fan anywhere you want. Not only can it be used indoors home, but it can also bring a cool feeling to your outdoor activities, like courtyard working, fishing, hiking, camping, and travelling