1. Battery voltage: 3.7V
2. Input voltage and current: DC5V/1500mAh
3. Output power: 5W
4. Charging time: about 4.5 hours when fully charged
5. Battery capacity: 4000mAh
6. Working hours: the first fan can be used for about 8 hours; the second fan can be used for about 5 hours; the third fan can be used for about 3.5 hours
7. Material: ABS/PP/fan circuit board
8. The third speed can be adjusted
9. Detachable front net + fan blades for easy cleaning
10. Size: 160x185x320mm
11. Packing list: one fan, one USB data cable, one manual, one certificate