Input: DC 5V/2A
Battery Voltage: 3.7V
Battery Capacity: 4000mAh Lithium
Using Time: 1.5/2.5/4 Hours (Strong/Middle/Weak)
Working Mode: USB or built-in battery
Effective Wind Speed: 4.5m/s
Lighting Source Power: 0.6W
Rated Power: 5.5W
Charge Time: 6 Hours