It is designed for enthusiasts with need for controlling numerous system fans. This cable hub is capable of expanding one motherboard PWM fan header to support up to five fans. PWM function and speed control can satisfy your control needs. This hub is compatible with 3-pin/4-pin fans (due to 3 pins is without PWM controller, 3-pin fans would run in full speed.) The cable management is supported. It is self-stick for easy installation and has options to hide the PCB itself. Since only one RPM signal can be read by one motherboard connector, only the CPU fan channel of the PWM splitter carries an RPM signal. Tips: 1. Only the fan on the CPU fan channel is used for monitoring. 2. All connected fans are following the same PWM signal. Speed control is the same for all fans when using fan controller software like AI stuite/Xspert FAN and EASY TUNE, etc.. 3. PWM capable connectors must be 4-pin, but not all 4-pin motherboard connectors implement or enable the PWM signal modulation by default. 4. Please carefully consult your motherboard documentation in this respect. 5. This is only a fan hub, not a fan speed controller. 6. Only the speed of 4-pin PWM fans can be adjusted by fan controller software. 7. The 3-pin fan would run in full speed and can not be adjusted when connected. Item Name: CPU Power Cable Hub Material: PVC, Tinned Copper Expansion Number: 5 Interface A: 1 x TX4 4pin Female Interface B: 1 x TX4 4pin Male (for CPU Fan), 4 x TX4 4pin Male (Chassis Fan) Wire Standard: 1007 22AWG Conductor 17 x 0.12TS Wire Diameter: OD 1.4mm x 4 Voltage: DC 12V Features: Portable, Durable, Easy to Use Hub Size: 5cm x 1.8cm x 1.2cm/1.97" x 0.71" x 0.47" (Approx.) Cable Length: 40cm/15.75" (Approx.) Notes: Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x CPU Power Cable Hub