Features: The Power supply of the governor is devided into two interfaces: 4 Pin and SATA interface, which can be arbitrarily selected according to the computer interface. The governor is devided into three gears that can be adjusted: Low gear(low speed gear), Off(closed stop), High(high speed gear) It is fixed with high-quality thickened for 3M glue, and the speed controller with strong viscosity is firmly fixed inside the chassis. It can be connected to 8 fans and supports 3Pin 4Pin interface fans. It can also be used as a fan hub with a speed control function. Specifications: Name：Cooling Fan Hub Material:ABS Weight:Approx 15g Type: SATA/4Pin Package Size: Approx 6X6X1cm /2.36X2.36X0.39in Package Includes: 1 x Cooling Fan Hub (4 Pin or SATA interface) note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow about 0-2mm measuring deviation due to manual measurement.