Specifications Power mode: USBSize: 145*145*119mmNoise: Below 36dBRated voltage: 3.7vRated power: 5WWind speed gear: 3 gearsBattery life: 6-8 hoursNumber of fan blades: 5 Notes 1. Please allow slight measuring deviation due to manual measurement. 2. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 3.Please leaving a message before you give the bad feedback, if Products have some problems.Thanks for your understandings.