ITEM NAME:1PC DC-DC 12V To 3.3V 5V Buck Step down Power Supply C0C0 For F9P7 Module W9D9 Description&Preview.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;.