USB Power Supply

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I just realized that if I plug the USB3 port to a computer, without plugin the power supply, the Guitar just starts.

Can USB Power supply be used then ? What Should be the specification ? Regular 5V / 2A ?

Is there any risk of shortcut or damage to the board ?
  You can use the USB to power supply in case of connecting some low power peripheral.Because the current of the USB Power port  is limited (lower than 1.5A).It is none of risk to the Board.

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