A converter is something which will convert one voltage to another voltage. A much better approach is to have devices which will accept any voltage from 100 volts to 250 volts. Almost all smartphone chargers will do that.
But perhaps what you want is a plug adapter so that you can plug your device into the outlets in a specific country. You can find out what outlets are used in a country by searching on the Internet, and then purchasing an adapter for that outlet. Amazon sells a wide variety of adapters.
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A converter is something which will convert one voltage to another voltage. A much better approach is to have devices which will accept any voltage from 100 volts to 250 volts. Almost all smartphone chargers will do that.
But perhaps what you want is a plug adapter so that you can plug your device into the outlets in a specific country. You can find out what outlets are used in a country by searching on the Internet, and then purchasing an adapter for that outlet. Amazon sells a wide variety of adapters.