STRONG WIND and QUIET>>Using the brushless motor industrial grade fans, high winds and long life have adequate safeguards. Battery works 4-11 hours for a fully charge (Depend on the mode you use). ADJUSTABLE 3 SPEEDS>>The battery operated fan speed can be adjusted among low, medium, high according to your demands. PORTABLE- Small and exquisite>>Easy to carry anytime, anywhere. As a power bank and Emergency lighting. Ideal for summer outdoor travel, camping, picnic, hiking, sightseeing, swimming pool, beach, car rear seats and so on. Also in the home and office, in the study / work / sleep, your desk, laptop, kitchen and any place need cool winds. USB OR BATTERY OPERATED>>Upgraded 2600mAh rechargeable battery (included) .Or connect Micro USB Cable to PC/notebook, power bank, car charger, 5V DC charger etc. One year replacement for defective product, 30 days no-hassle refund & return and friendly customer support from Yolanda.