10pcs/1pc DC-DC Buck Power Supply Module Adjustable Step Down Converter Board 5V-30V To 3.3V 4.2V 5V 9V 12V 3A for Car Charging

10pcs/1pc DC-DC Buck Power Supply Module Adjustable Step Down Converter Board 5V-30V To 3.3V 4.2V 5V 9V 12V 3A for Car Charging

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