4 pin PWM Fan rgb splitter controller hub PWM Fan Controller 1 to 10 ports Compatible with 3 Pin, 4 Pin fans Please note: 4Pin fan speed can be adjusted by temperature control. 3Pin fan can also be used, but because 3Pin has no PWM function, it is at fixed speed (full speed) after inserting In the hub interfaces, the RED CPU interface is the CPU fan dedicated interface (with speed detection function). Since the mainboard can only receive one rotation speed signal, the remaining nine conventional fan interfaces have the PWM function, but no speed signal(will work at full speed) 40cm PWM cable include