PRICES MAY VARY. 40000mAh Mighty Battery: This Portable fan built in 40000mAh rechargeable battery, it can be work 15-220 hrs when fully charged (9-10hrs), the battery indicator help you keep track of remaining power. Equipped with 5V/3A type-C input/output port and a USB-A output port (on the back of the fan base), can be power for other electronic devices. It's a lifesaver in emergencies like Hurricanes, Storms, heatwaves, power outages, and also perfect for camping, outside, travel, work…