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This PWM fan extension cable is universally designed for 3-pin and 4-pin PC case cooling fans. Adopted high-strength black nylon braided outer layer, it offers excellent durability, abrasion resistance and internal chassis aesthetics. The 11.8-inch proper length solves insufficient original cable length issues, helping arrange internal wires reasonably and improve heat dissipation. It maintains stable power and signal transmission to ensure normal fan operation and precise speed regulation. Plug and play, easy to install, ideal for ATX case assembly, DIY modification and fan upgrading.