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This 4Pin PWM fan extension cable is specially designed for desktop chassis cooling fan wiring extension. It perfectly extends the original fan power and speed control line, effectively solving insufficient cable length issues during fan installation and case modification. It maintains full PWM fan speed adjustment function, ensuring accurate speed control and stable heat dissipation performance. Made of durable flexible wire, easy to arrange and fix. Widely applicable for gaming PC, work station and all DIY computer cooling system wiring arrangement.