The Asus Battery charger that came with my Nexus 7 is from 110 volts 0r 220 volts input. It looks like the Asus  charger will auto select the input voltage. So it looks like to me if you plug you Asus charger that came  with your Nexus 7 in the adaptor you have ordered, you are good to go.
Most of the countries you are traveling to has 220 volt standard.

FXSarge,

Yeah, that looks mighty good... Might wait for the Microsoft table and see what it looks like with Windows 8.

I went online and purchased an app with my credit card. I was billed for the purchase ,no credit, and another $1.00 was added on to the purchase for some reason. I called Google but received no satisfactory answer, so beware of ordering paid apps from google...
Has anyone else had this problem with buying paid apps. Don't know how you get the credit.
I am thinking about returning this Nexus 7 back to where I purchased it...