Material: ABS, Capacity: 300mAh Wind force: three levels Battery: Built in rechargeable battery Product size: 9.6 * 9.7 * 9.2CM -- Concise and Compact: the fan is with adjustable straps, easy to fit different wrist sizes, ideal for most people, the small dial does not take space, convenient to carry in your pockets or bags -- Quality Material: the dial for the portable wrist fan is made of quality plastic, and the strap is made of soft elastic material, comfortable to wear; There are rechargeable polymer lithium batteries inside, and we provide you with 1 piece of USB charge cord, enabling you to charge on the device with USB port, suitable for laptops, PC, mobile power supply, wall socket, car charger and so on, without worrying about running out of energy -- Multifunctional and Practical Design: you can use the USB rechargeable personal fan in different ways, either wearing it on your wrists or placing it on tables are fine, with 3 kinds of wind speeds to choose from, sufficing your daily needs; You just press the button to turn on and off, and the speed adjust button -- Relax Yourself: the USB rechargeable fan can provide strong but soft wind, and you can take them with you, to enjoy the cool wind during studying, reading, traveling and more, ideal for both indoors and outdoors, you can use them either at home, office or in the park, will not bring uncomfortable feelings