It is designed for enthusiasts with need for controlling numerous system fans Capable of expanding one motherboard PWM fan header to support up to Eight fans. Powered directly by Molex 4-pin LP4 cable from the computer power supply 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.