You might find that some devices don't have a DC barrel input, but take a 9V battery - we've got you covered!
Just plug this into the DC barrel (2.1mm x 5.5mm), you can then connect it as you would a 9V battery.
2.1mm to 3.5mm headphone adapter while also reversing the polarity.
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- Input port 2.1mm x 5.5mm specification