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This 4-pin PWM fan extension cable perfectly extends the connection distance of chassis cooling fans and CPU fans. The 27cm moderate length solves wiring limitations in large or compact chassis, helping organize internal cables and improve airflow. It supports full PWM speed adjustment for precise fan speed control and quiet operation. Made of high-quality insulated wire, it features stable signal transmission, wear resistance and easy bending. Plug-and-play installation, widely applicable to daily PC assembly, hardware modification and fan expansion upgrades.