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This practical fan power conversion cable comes with independent control switch, converting DC power jack into dual fan interfaces. It is compatible with both 3-pin and 4-pin computer cooling fans, perfect for external fan setup, hardware cooling test and desktop auxiliary heat dissipation. You can easily control fan working status without plugging or unplugging wires. Premium insulated wire ensures safe operation, ideal for DIY cooling system, case modification and outdoor equipment heat dissipation use.