<p>Features: Capable of expanding one motherboard PWM fan to support up to ten fans. It is designed for enthusiasts with need for controlling numerous system fans. The PWM interface is connected to the CPU- fan interface of the motherboard,and the red is the dedicated interface for the CPU-fan (with speed measurement function). The black interface is a PWM conventional fan interface (no speed measurement signal, but does not affect the PWM function). Support sata- or large 4D power supply, which can reduce the load pressure on the motherboard. The temperature control line PWM is separately connected- from the motherboard, and the power- supply and temperature control are correct. Suitable for 12V Smotherboard 3pin / 4pin fan, 3pin fan can also be used, but plug- in to run at full speed, because 3pin fan has no PWM speed regulation Specification: Item Type: 10-Port Fan Hub Type: Large 4D port power-supply/ Sata-power supply (optional) Line Interface: Small 4Pin PWM Size: approx70x46x11mm/2.76x1.81x0.43in Color: Black Cable Length: Approx40cm/15.55in Voltage: for DC12V Package Includes: 1PC Cooling Fan note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! 4.Only 4-pin PWM fans speed can be adjusted by fan controller software. 5.3-pin fan would run in full speed, can not be adjusted when connect-. </p>