This governor can supply to 4 fans, and rotating the potentiometer can adjust the speed of 4 fans at the time. The fan supports 2P, 3P and 4P fans, and all 3 types of fans can adjust the speed. NOTE: The fan can only be used with PWM speed control function, and there must be a PWM speed control line. installation : 1. The adhesive pad at the bottom of the governor can be glued and fixed in the chassis. 2. Make holes on the chassis according to the size shown in the figure, and the potentiometer can be fixed in the hole of the chassis through nuts. 3. Set the screw column on the chassis according to the size of the fixing hole of the circuit board as shown in the figure, and fix the governor on the screw column. Number of fan seats: 4 Load current: 7A supply voltage: 12V supply interface: 6 pin Speed adjustment range: 0-full speed Fan interface type: 2P, 3P, 4P Material: PCB+Plastic+Metal colour: green Package Contents: 1 x Fan Speed Controller Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.