ITEM NAME:2x PCI Speed Controller W/ OFF Switch PC 3 Channel 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. Package Included: 2 Pieces PCI Fan Controller Bracket 2 Pack of Screws.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.