The euro is the official currency of Portugal, which is a member of the European Union. The Euro Area refers to a currency union among the European Union member states that have adopted the euro as their sole official currency.
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1 If you also add 12 rechargeable batteries, a L.E.D. flashlight, and a portable world-band radio, then you would have light, and entertainment, and access to global news events for many, many years into the future.  They will work in a grid-down situation when there is no electricity (as long as the sun is shining).