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This 12V step-up USB fan power adapter cable comes with a 24-inch 60cm black sleeved design, specially made for powering 3-Pin and 4-Pin PC cooling fans. It converts regular USB power to stable 12V output to run fans at full rated speed, ensuring reliable cooling performance. The sleeved cord improves bend resistance and long-term service life while keeping wiring tidy and organized. Easy plug-and-play setup, perfect for DIY chassis cooling, external fan arrangement and desktop auxiliary heat dissipation.