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This 2-piece DC-DC step down module converts 6V-32V wide voltage input into stable USB output with QC3.0 fast charging function. It is widely compatible with 12V, 24V and other DC power sources, ideal for vehicle power modification, industrial equipment and electronic DIY projects. Adopting premium control chips and stable circuit design, it delivers efficient voltage reduction, continuous fast charging output and excellent heat dissipation performance. Small in size and easy to install, it provides safe and reliable fast power supply for mobile phones, tablets and small electronic devices.