1. Battery voltage: 3.7V
2. Input voltage and current: DC5V/1000mAh
3. Output power: 4W
4. Charging time: about 2 hours when fully charged
5. Battery capacity: 1200mAh
6. Working hours: the first fan can be used for about 6.5 hours; the second fan can be used for about 3 hours; the third fan can be used for about 2.0 hours
7. Material: ABS/PP/fan circuit board
8. Three speeds can be selected
9. Support up and down angle 180 degree adjustment
10. Small size, easy to carry
11. Size: 60x90x221mm
12. Packing list: one fan, one USB data cable, one manual, one certificate