Convenient USB chargingchoose convenient to use, battery power supply, plug power supply,Mobile power, charger, car USB interface, laptop, desktop computer USB interface, etc. can be charged Rechargeable large capacity batteryRechargeable lithium ion battery can provide customers with 4 to 12 hours of working time. Long working time, no need to charge and replace batteries frequently. The mini handheld fan is very safe and efficient, andis a must-have item in summer. 3 Adjustable settingsmulti-function fan-indoor and outdoor portable fans-low, medium and high speed levels. Press the power button repeatedly to adjust the appropriate fan speed. It allows you to cool down quickly and avoid summer and hot flashes. Portable design and low noisevery compact and portable. The innovatively designed fan blades are designed to simulate natural wind and bring you natural, comfortable and cool wind. Using a high-quality brushless motor, it can produce the highest speedwith minimal noise. Let you enjoy quiet study, work and sleep environment. Applicable sceneVery suitable for home, office, school, travel, gym, barbecue, camping and outdoor activities, but also very suitable for baby sleep.