Input Voltage: 4.75V-5.25V Input Current: 0.8A-1.1A Output Volatage: 5V-10V Output Power: 5W Max Battery Specification: 18650 Li-ion 3.7V Dimension: 5.1*4.1*1.5 Inch It's a very convenient portable small fan. In hot summer, you can carry it outside since it's battery powered. It's perfect for hiking cycling climbing travel and so on. You can put it on your office table or home desk when you are at home or office. It's a very cool fan! ●NEW DESIGN: A professional portable fan with integration of design, simple appearance and firm structure. LED lighting function;Three gear speed, according to your need to debug a suitable own air volume. ●CHARGING WAY: Charge battery through the Micro USB input. Powered By Electric-powered or 18650 Lithium Rechargeable Battery Micro USB Cable Via USB Port of Notebook/ Computer. ●HIGH QUALITY : The structure of these fans is unique and fashionable. Using the brush and slot less motor, to ensure the high winds and long-life. Intelligent control system, reliable performance,which is fully functional and easy operation. ●MULTIFUNCTION: Use 4.5 W brushless motor industrial fan (4 inche), big air volume is long life. Battery compartments for disassembling structure, convenient for the user to maintain. Cool Fan perfect for desktop indoor and outdoor activities as camping, hiking, cycling, backpacking, biking, climbing, boating, travel and more. ●WORKING TIME: Charging time about 4 hours. Blowing time: 1 speed: about 8 hours, 2 speed: about 4 hours, 3 speed: about 2 hours.