Except if you travel to Europe (as is most of my travel). Then you might need more adaptors, like this:

http://www.amazon.com/Travel-Conair-M-50...+power+adaptors

Nicely, all of the chargers for my devices (phone, tablet, e-reader, laptop) will handle the 220 50 cycle European standard; you just need to be able to get it to plug in. . .