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This 30cm USB to fan power cable is designed with a convenient on-off switch for simple power control. It connects standard USB port to 3Pin / 4Pin PC cooling fans, providing stable power supply for heat dissipation. The moderate length enables neat internal and external wiring, while solid cable construction ensures long-lasting use. Easy to plug and play, ideal for computer case cooling, DIY airflow modification, desk fan and small cooling fan power supply.