Simply plug the USB into an adapter or computer, connect the 4-pin end to the fan, then turn on the switch and adjust the speed with the .
and high quality
Made of high quality material, and practical to use
Easy to install, can directly replace old or damaged old products
Professional manufacturing, stable performance, high reliability

Color: Black
Material: plastic

Package Contents:
2*USB 5V to 12V 4 Pin Fan Speed Adapter