This module is buck / boost converter, can be powered by USB or welding pad, easily step-up/down voltage by adjusting potentiometer.
DC-DC Power Converter Input Voltage Range is 3.5-12V, support standard USB and Micro USB 5V; Adjustable Output Voltage Range is 1.2-24V 3.3V 9V 12V 24V.
Adopting multi-turn high precise adjustable potentiometer. Clockwise for Step Up, Anticlockwise for Step Down.
Automatically save the state when power off.
ON/OFF Switch: Switch on/off output and digital display freely. Short press the switch to close the output; Press and hold the switch to turn on/off the digital display.