USB charging fan: Built-in 4800mAh rechargeable battery, can work for a long time. Comes with a 5V/1A USB cable, which can only charge for 5 hours, and the fan can last for 4 15 hours.Multi-function: This portable fan is very suitable for personal cooling, office, GYM outdoor activities, such as camping, traveling, hiking, climbing and watching sports games, etc.Product name: Double head hanging neck fanBattery capacity: 4800mahProduct weight: about 258gRated input: DC5V 1ARated power: 5WLife time: 4-15 hoursCharging time: about 5 hoursPower supply mode: USBMode of operation: mechanicalSize: 670x65x33mmMaterial: ABS + SiliconePackage Contents:1 bladeless fanIf you have any questions about the problem, please feel free to contact us, I hold you have a satisFactory Shopping Experience!