Convenient USB chargingchoose convenient use, battery power, power outlet, mobile power, charger, car USB interface, laptop, desktop USB interface, etc. can be charged Large-capacity rechargeable batteryThe rechargeable lithium-ion battery can provide customers with 4-12 hours of working time. Long working time, no need to charge and replace batteries frequently. The mini portable fan is very safe and efficient, and is a must-have item in the summer. 3 Adjustable Settings Multifunction 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 noise very compact and portable. Innovatively designed fan blades are designed to simulate natural wind and bring you natural, comfortable and cool wind. Using high quality brushless motor, it can produce the highest speed with minimal noise. Let you enjoy a 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 sleeping.