Features:
New and high quality
-USB fan speed controller.Mute multi-position wind speed regulator.It is suitable for offices, dormitories etc..
-DC 5V for the non-adjustable USB fan.Boost board inside the fan for the two-position fan.This boost board step up voltage for motor in fan when in the second gear.Causes the fan to turn faster and the wind becomes bigger.

Working Voltage:DC 4V-12V
Output Voltage:DC 2.5~8.0V
Rated power: 5W(Do not overload!)
Test temperature: -40~85℃
Physical dimension:50*44*18mm

Package include:
1 x USB Fan Speed Controller