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This 30cm USB to 3-Pin/4-Pin fan power cable allows you to supply stable 5V power for computer cooling fans via any standard USB port. It supports both 3-pin and 4-pin 5V fans for wide compatibility. The cable provides steady current for quiet, vibration-free fan operation. Made with high-quality wire and reinforced connector, it features great flexibility and anti-break performance. The compact 11.8inch length keeps wiring neat and saves installation space, perfect for desktop case cooling, DIY cooling projects and daily fan power replacement.