ITEM NAME:1PC DC-DC 12V To 3.3V 5V Buck Step down Power Supply Module For HOT HOT SALE body .shopclass { float: left; width: 100%;.3ï ¼Å’ input interface is 2.1 5.5 DC female base;. 5ï ¼Å’input and output using multiple pin, easy to use and connect;. You can follow below process to chontact us. 6ï ¼Å’ PCB board size: 3.5cm 3.5cm;. 7ï ¼Å’ with power indicator;.