I have a Macbook Air purchased in 2011 in the US.  I am traveling in South Africa and am unsure if I need a step down voltage converter before I plug my laptop into the wall to charge it (using an outlet adapter).  Am I ok to just plug in?

So standard electrical output from wall outlets in the US is 110V - 120V, and standard output from wall outlets in South Africa is 220V - 240V.  In SA I know I can plug in an iPhone using the iPhone charging cable and it will automatically step down the voltage, thus preventing my phone from overheating.  I cannot plug in a hairdryer or flat iron without step down voltage converter in SA.  Can I use the charger that came with my US 2011 Macbook Air and plug into a wall outlet in South Africa or do I need to purchase a step down voltage converter in order to charge my laptop while in SA?

You only need a plug adaptor as long as the voltage is between 100 and 240 volts.
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