Features: This Speed Controller adopts materials, with low loss and low heat. The precision adjustable resistance has high accuracy and excellent performance, and the speed can be adjusted at will. The cooling fan hub is equipped with an independent speed controller for you to adjust. 8-fan stepless variable speed upgrade, 1 Knob control speed regulation. Support 3Pin/4Pin dual-type standard fan port. Specifications: Power Supply: 4Pin Material: Plastic + Metal Colour: Black Power Supply Voltage: 0-12V Connectable Fans: 4 Adjustment Method: 1 Manual Adjustment Knob Installation Position: PCI Position of PC Chassis Fan Interface: 4PIN (3PIN Can be connected) Note: No retail package. Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 x Fan HUB Speed Controller