You can control this using the button on Shargeek 100. Once you have entered the DC interface in the menu, you can set the voltage using the +/- buttons, whereby the unit for the adjustment is 1V or 0.1V. The adjustable voltage ranges from 3.3V to 25.2V. Max. 75W DC. Power supply either DC or the USB-C1 port, but not both at the same time.