Features: brand new and high quality This fan speed controller adopts brand new materials, with low loss and low heat. It is designed for enthusiasts with need for controlling numerous system fans. Capable of expanding one motherboard fan header to support up to eight fans. 8-fan stepless variable speed upgrade, 1 knob control speed regulation. Support 3Pin/4Pin dual-type standard fan port, and Sata / 4 Pin power supply optional. Specifications: Power Supply: 4Pin / Sata (Optional) Material: Plastic + Metal Colour: Black Power Supply Voltage: 3V-12V Power: 36W Connectable Fans: 8 Adjustment Method: 1 Manual Adjustment Knob Installation Position: PCI Position of PC Chassis Fan Interface: 4PIN (3PIN Can be connected) Size: approx 120 X100mm/4.72 X3.94in 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! Package includes: 1 x Chassis Fan Speed Controller