What is the voltage of the WD My Cloud?

I have the 4TB one.

I am in a foreign country and wondering if a simple adapter that you plug in like this (220 to 110) will work. Screen Shot 2015-01-28 at 4.34.42 AM.png

You shouldn’t need a voltage converter.   The My Cloud power supply is auto-ranging (100V-240V, 50Hz-60Hz).

By the way, the plug you’re showing there isn’t changing the voltage – it’s just a pin adapter, and yes, it should work.