Portugal uses 230V, 50Hz with sockets and plugs Type C and Type F.
Sockets/plugs in Portugal are completely different than in United States so you will need an adapter.
Frequency difference (60 Hz in United States vs 50 Hz in Portugal) is generally not a problem - almost all items (except some types of clocks) will work on both and you shouldn't worry about it.
Although Portugal uses 230V (which is different voltage than in United States) you probably won't need a transformer/converter if you use recent devices and appliances because they all work worldwide automatically.
Sockets & plugs category is available in production API version 2.