Hot summer comming.Our mini handheld fan comes with a 3000mAh power bank, only need to charge for 4-5 hours, you can enjoy the cool wind. There is also a USB charging port, which can be used as your backup power source to provide you with power in an emergency.It has three winds, and the battery life is different for different winds. The first wind can enjoy 11 hours, the second wind can enjoy 8 hours, or the third wind can enjoy 6 hours.This hand-held fan can be applied to travel, family, outdoor camping,Shopping, walking, cooking, working, resting and studying, etc. The long battery life allows you to enjoy the cool wind even in the wild.