You will not need an electrical converter or special adaptors for electricity in Costa Rica if you are coming from the United States or Canada. It is the same standard 110 voltage as these countries use.
If you are coming from any other country that uses a different voltage, such as most European countries, you should bring a converter that is compatible with 110 voltage.
If you are bringing an item that requires 3 prongs, you may want to consider bringing a 2 prong converter.
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