The speed governor can completely shut down the fan, freely adjust the voltage to control the fan speed, and the highest voltage can be adjusted to 12v (about 11V) (12v voltage fan is full speed) This governor uses brand new materials, with low loss and low heat generation. The precision adjustable resistor has high accuracy and excellent performance, and the speed can be adjusted at will! With protection chip. Fan speed controller to tune up / down fan speed by by knob Multi-channel interface, you can connect multiple fans, the motherboard 3pin or 4pin can be used, the power supply interface has a large 4P interface and a SATA interface for easy selection. The measured output is 6A=72W power, and a single interface is about 0.6A [only theoretical value, for reference only] [not overloaded] Colour:Black+blue Material:PCB+metal Package Contents: 2 * Governor Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.