Please be aware that whilst a travel adapter will allow you to physically fit a US plug into a different receptacle it will not change the voltage or frequency of the supply.
Voltage - The mains voltage in Costa Rica is 120 V which is compatible with all US appliances (US voltage is currently specified as 120 V + /- 5%).
Frequency - The frequency is 60 Hz which is the same as the US.Need another travel adapter? Search by Country
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