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This 9V to Barrel Jack Adapter couldn’t be easier to use: just attach the adapter clip to a 9V battery, the barrel jack to your Arduino board, et voilà! Now you have a mobile power supply you can bring to work on your electronics projects on the go!
This adapter is suitable for any 9V powered devices, and as such is perfect for the 7-12V powered Arduino boards! But really, as long as your device is comes with a female barrel connector, you will be able to power it with this adapter.