Feature: 1. Knob Adjustment: Professional high speed adjustment circuit, high performance. 4 knob cooling fan speed controller, this cooling fan hub is equipped with a separate speed controller. 2. Features: PC 8 channel fan hub reduces speed when computer parts are idle to reduce noise and power consumption. When the computer part is busy, increase the speed to reduce the computer part temperature. 3. Material: Made of high quality material, durable, firm and stable. 4 Knob Cooling Fan Speed Controller is made of plastic and metal material, durable, reliable, low loss, low heat. 4. Universal: Widely used in PC computer water cooling system, easy to install. Fan interface: 4 PIN (3 PIN can be connected). Power interface: SATA. 5. Space Saving: Mini size, suitable for more types of computer cases. The PC 8 channel fan hub governor is installed in the PCI position of the chassis, which is easy to install and does not take up space. Specification: Item Type: PC Fan Hub Product Material: Plastic, Metal Power Supply Voltage: 0-12V Connectable Fans: 8 Fan Interface: 4PIN (3PIN Can Be Connected) Power: 72W Adjustment Method: 4 Manual Adjustment Knob Power Interface: SATA Interface Installation Location: PC Case Location PCI. Package List: 1 x Chassis Fan Speed Controller1 x Small Screw