HJIAN 4-inch Table Fan 3 Speeds USB Mini Fan Portable fan Rechargeable Desktop Fan Battery Fans Cooler Cooling Personal Fan Table Fans (White) Battery type: Li-ion 18650 3.7V (INCLUDED). Please fully charge the fan to activate the battery before firstly use. Mini portable design, convenient to carry anywhere and anytime. Muitiple charging ways: connect micro USB charging cable via computer/notebook, car charger, power bank, 5V wall USB charger, 5v solar charger etc. 3 settings of the air flow speed: high, mid and low. Upon to your choice. NOTE: The fan only has one mode if you take out the battery and powered by USB. Suitable for home and office desktop table, baby stroller, vehicle, camping tent or nightstand.