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This 30cm USB to 4-Pin Molex cable is specially designed to supply 5V power for computer case cooling fans. It easily converts standard USB port into 4-pin Molex connector, enabling convenient fan power connection without motherboard header limitation. Premium wire material ensures stable current supply and safe operation. The proper length allows tidy layout inside or outside the chassis, plug and play for effortless use, perfect for DIY chassis cooling modification and auxiliary fan power supply.