Description: 100% brand new and high quality Features: Creative design, turning the stepless governor fan into a speed adjustable fan. Free to adjust the wind strong or weak. Equipped with a LED dimming module, conveniently to adjust the voltage. Timer design helps you to sleep well and save money. Small size and easy to use, suitable for different kinds of USB fans, fit for office, car, dormitory, etc.. Fan governor only, other accessories demo in the picture is not included Specification: Material: Fiber glass board and electronic component Size: app.72 x 25 x 15mm/2.83x 0.98 x 0.59in Working voltage:DC 4V-12V Output voltage:DC 2.5-8.0V Rated power: 5W(Do not overload ) Timer:0-999minutes Color: Black Quantity: 1 Pc Working principle: 1. The input power supply is DC 5V for the non-adjustable USB fan.There is a boost board inside the fan for the two-position fan.This boost board step up voltage for motor from fan when in the second gear.It causes the fan to turn faster and the wind becomes bigger. 2. The USB governor output voltage range varies from 2.5 volts to 8.0 volts.The wind speed is set arbitrarily. 3. Please set the fan in the first gear when use this USB Governor.Otherwise it can not work normally. Use Steps: 1. Set the fan in the first gear. 2. Connect fan from Female USB socket. 3. Connect work voltage at Male USB socket. 4. Turn potentiometer left to increase output voltage to increase fan speed. 5. Turn potentiometer right to decrease output voltage to decrease fan speed. 6. Press potentiometer to enabled/disabled output voltage. 7. Double click potentiometer to turn ON/OFF screen.Any press to wake up display. Set Timer: 1. Keep press potentiometer about 3 second enter into timing set mode.Disabled timer by display '---'.Enabled timer by display any numbers. 2. Short press potentiometer to enabled/disabled timing function. 3. Turn potentiometer left to increase time. 4. Turn potentiometer right to decrease time. 5. Keep press potentiometer about 3 second to save and exit and begin to countdown. Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 x Fan Governor