Battery type: Li-ion 18650 3.7V (INCLUDED); The fan only has one mode if you take out the battery and powered by USB.High winds and long life have adequate safeguards.Using the brushless motor industrial grade fans， high winds and long life have adequate safeguards.International standard 18650 capacity lithium battery provides exceptionally long using time and strong power output.The integration design， simple appearance， solid structure， it is realize the huge wind capacity fan portable， more confidence in the transport and using.siez: L140*W110*H42��mm)