Features: 1.Solve the lack of motherboard interfaces and concentrate on processing fan wires. 2.The PWM interface is connected to the motherboard CPU fan interface, and the red is the dedicated interface for 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). 3.The power supply can be directly supplied by the power supply to reduce the load pressure of the main board. The temperature control line PWM is connected separately from the main board, so that both power supply and temperature control are correct. 4.Suitable for 12V motherboard 3pin/4pin fan. (3pin fan can also be used, but it runs at full speed when plugged in, because 3pin fan has no PWM speed control function) 5.Expand the four?pin port of a single motherboard into multiple ports for uniform speed adjustment. (If your fan is a 3?pin fan, you can also plug it in, but PWM control speed cannot be achieved.) 6.There is an adhesive on the back of the hub PCB board for easy pasting on a flat place, and there is a fixed screw hole. specification:Condition: 100% Brand New Item Type: PC Chassis Fan Hub Material: Metal Suitable: For 12V main board 3pin / 4pin fan.It can also be used for 3pin fans, but it runs at full speed when plugged in, because 3pin fans have no PWM speed control function. Interface Type: Large 4D Interface, SATA Interface PackageList:1 x PC Chassis Fan Hub1 x Cable NoteAvoid speed measurement confusion, computer crashes, a multi?channel interface expanded from one interface, only display the speed measurement of one of the fans. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.