Feature: 1. Versatile Function: 8 channels fan hub reduces fan speed during idle computer components to minimize noise and power consumption. It increases speed during busy periods to lower component temperatures. 2. Knob Adjustment: 4 knob cooling fan speed controller comes with independent speed controls, allowing precise adjustments for optimal cooling performance. 3. Universal Compatibility: Widely used in PC computer water cooling systems, this controller is easy to install. Fan interface: 4 pin (compatible with 3 pin). Power interface: SATA interface. 4. Space Saving: PC 8 channels fan hub speed controller is installed in the PCI slot of the computer case, offering convenient installation without taking up additional space. 5. Durable Construction: Constructed with durable plastic and metal materials, the 4 knob cooling fan speed controller is reliable, low loss, and low heat, ensuring long lasting usage. Specification: Item Type: PC Cooling Fan Speed Controller Material: Metal, Plastic, PCB Voltage Range: 0-12V Compatible Fan: 8 Fans (not included) Maximum Power: 72W (theoretical value) Control Method: Manual Knob Control Installation Position: PC Case PCI Slot Power Interface: SATA Powered Fan Interface: 4PIN (compatible with 3PIN). Package List: 1 x Speed Controller 1 x Screw Note: The inbuilt resistor of the speed controller may generate heat during use, which is a normal phenomenon. Additionally, there is a power limit and it is not recommended to connect violent fans with a power exceeding 10W individually, as it may damage the product.