ITEM NAME:PCI Speed Controller W/ OFF Switch PC 3 Channels 3 pin Cooling Fan Control Description: Increase speed to reduce computer part temperature when computer parts are busy. Reduce speed to reduce noise & power consumption when computer parts are free. Supports computer parts with cooling fan, like CPU, HDD, DDR, VGA, etc. Supports input voltage 12V/Output:3v-12v(adjustable) Support 3 channels fan speed adjust simultaneously, total 20 Watt Max. Specification: Supports fan speed revolution from 30% to 100%. PCI bracket available to install fan speed controller. Adjustable knob available to adjust cooling fan revolution speed. 4 pin male and female connectors available for power. Cable length: 31cm 3 pin Fan connector available for fan 3 pin or 4 pin slot. Size Chart: Approx.118x20x32 mm/4.6x0.8x1.2 inch Package Includes: 1 Piece PCI Fan Controller Bracket 1 Pack of Screws Note: Please allow slightly 0-1cm difference due to manual measurement. Color may be slightly different since different monitor. Thanks for your understanding and attention. Wish you a pleasant shopping experience!.Support 3 channels fan speed adjust simultaneously, total 20 Watt Max. 4 pin male and female connectors available for power. Cable length: 31cm. 3 pin Fan connector available for fan 3 pin or 4 pin slot.