O-Best 3 Speeds Electric Portable Mini Fan Desk Table Desktop Fan Rechargeable Battery/ USB Powered Laptop PC Mac Mute Cooler Cooling Fan for Office Home and outdoor Travel (Purple-A) Pocket Size -- Easy on the go! Dual Power Sources: plug in USB or use with Rechargeable Li-ion 18650 Batteries Different ways to charge fan with lithium battery in: support Android charge connect micro USB charging cable via computer/notebook, power bank etc Max Support High efficient and 2-8 Hours long working time (Depend on the mode you use) 3 speed settings by pressing the ON button. One Led lamp designed on side.