It is designed for enthusiasts with need for controlling numerous system fans 5 solid-state capacitors adopt PWM fan hub, make cooling system more stable power supply security Capable of expanding one motherboard PWM fan header to support up to five fans. Support PWM Funciton, Speed control, satisfy your control needs. Compatible with 3-pin / 4-pin Fans Support Cable Management Comes with Self-Stick for easy installation and options to hide the PCB itself. Since only one RPM signal can be read by one motherboard connector, only ' CPU Fan' channel of the PWM splitter carries an RPM signal; thus the motherboard will only read the RPM signal of the PWM device that is connected to channel 1 of the splitter.