Also you will need a 5 volt battery to make it portable. I use one of those cellphone power bank chargers. They are cheap on ebay like $10. You will have to buy a cable or splice your own so you have a 5.5mm on one end and a USB on the other end. I cut the 5.5mm off the power supply that comes with it and found a USB cable to splice it to. But certainly they sell ready-made cables for this.
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