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This USB (input) to DC (output) boost converter can step up 5V to 9V/12V, with a switch for selecting the output voltage level and a digital LED display for showing the output voltage.
The USB input can be connected to various power supplies, power banks and other USB power sources.
When using a step-up converter, remember that the conversion of voltage usually comes at the cost of current! The output of this converter is ~1A at 9V and ~0.8A at 12V MAX (stability and current level depending on the input power source).
The converter comes with a 3.3x1.35 adapter.