DC-DC Buck Step Down Converter Regulator Charger Module 5-40V to 3V 3.3V 3.7V 5V 6V 7.5V 9V 12V Power Bank Charger Accessory

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98% 4a mini dc-dc buck converter 6v-16v 9v 12v 15v to 5v 3.3v step-down power voltage regulator module mobile power car

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