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This boost converter power cord takes 5V power from regular USB-A source and elevates voltage to steady 12V for low-power DC devices equipped with 5.5×2.1mm DC jack. No complicated installation required; simply plug USB end into power source and connect target equipment on DC side. Internal protection circuitry effectively prevents burnout caused by overload or short circuit. Perfect economical replacement power solution for small cooling fans, low-voltage LED lighting, compact routers and mini audio speakers at home and DIY electronic projects.