ITEM NAME:Micro USB Fan Stepless Speed Controller Regulator Speed Variable Switch Module Product Description USB Fan Stepless Speed Controller Regulator Speed Variable Switch Module Specification: 100% Brand new and high quality. Type: Power Module Model: USB Fan Governor Color: As pictures shown Power Supply Current: 500MA Rated Power: 5W Power Supply Range: DC4 ~ 12V Output Range: DC2.5 ~ 8.0V Conversion: 1cm=0.39inch, 1inch=2.54cm Features: Turn the knob clockwise to increase the air volume. Turning it counterclockwise will make the air volume gentler. Insert the governor into the mobile phone charger or charging treasure, then insert the fan USB plug into the USB port of the governor, and then adjust the large volume of small air volume by turning the adjusting knob. Fine workmanship and good performance,Easy to use,Long service life. It is suitable for the very common 5.0vusb fan on the market. Usage Method : Plug the governor male into the mobile phone charger, power bank, computer USB, etc., and plug the fan into the governor female! Or use micro usb5.0v for power supply. Matters Needing Attention: When it is used to adjust the fan in two gears, please put the fan in the first gear, otherwise it may not be able to adjust the speed! Package included: 1 x USB Fan Stepless Speed Controller Regulator Notice: 1.Please allow 1-3mm error due to manual measurement,Please make sure you do not mind before you.Model: USB Fan Governor. Type: Power Module. It is suitable for the very common 5.0vusb fan on the market. Output Range: DC2.5 ~ 8.0V. We will do our best to help you to resolve your problems. Color: As pictures shown.