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This 30cm USB to Molex 4-Pin fan power cable is specially designed to supply power for computer case cooling fans through a standard USB port. Equipped with a practical on/off switch, you can freely turn the fan on or off without plugging and unplugging repeatedly. The cable delivers stable power output, ensures quiet and steady fan operation. With a proper 30cm length, it enables neat internal wiring and flexible installation. Made of high-quality materials, it features good toughness, anti-aging and long service life. Perfect for PC case cooling fans, DIY fan modification and other Molex 4-Pin powered cooling devices.