4V-12V 5W XY-FS USB Fan Stepless Governor USB Fan Speed Controller Multi-Gear Auxiliary Cooling Tool fan motor speed controllerFeatures:Brand new and USB fan air regulator.Strong and weak winds can be adjusted at will!Fan speed regulation principle: The adjustable USB fan is a 5-volt direct supply fan motor, while the two speed fan has an internal circuit board. When placed in the second speed, the board raises the USB 5V and then connects to the motor, resulting in a higher air The output voltage range of this stepless governor smoothly varies between 2.5V and 8.0V, and the air can be set arbitrarily! And the range is wider! Turning the knob clockwise can increase the air while turning it counterclockwise can reduce the air and the knob has a switch function!Suitable for the very common 5.0V USB fan on the market.Insert the male head of the governor into the phone charger, computer USB, fan plug, and then plug into the female head of the governor! Alternatively, use Micro USB 5.0V power supply.Specifications:Power supply range: 4-12VOutput range: 2.58.0V power: 5WPackage Includes:1 x USB Fan Stepless GovernorNote:No retail package.Please allow 1-3mm 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!