Jrifedptry 5V USB Fan Speed Controller Voltage Regulation Module Motor Speed Controller USB-A Interface DIY Heatsink Control Switch

It is small and can be carried around, does not take up a lot of space, and is easy to carry. It is suitable for 5V USB fans on the market and can be installed on the notebook computer radiator fan. It also supports mobile phone chargers, USB power , and computers with USB interfaces. USB fan air volume adjustment, stepless speed regulation, and arbitrary adjustment of weak and strong winds. This small USB device voltage regulation module increases the voltage by adjusting clockwise and reduces the voltage by adjusting counterclockwise. The output voltage range of this stepless speed regulator varies between 2.5V and 7.5V, and the air volume can be set arbitrarily, with a wide range. The clockwise knob can increase the wind speed, and the counterclockwise knob can reduce the wind speed. The knob has a switch function.