Which adapter for Argentina?

I'm traveling to Buenos Aires for ten days next
month, and I'd like to bring my 2nd gen. shuffle for
the long plane ride. (I have a 4th gen. iPod, too,
but it doesn't have enough battery left for the
10-hour flight.) I have the USB power adapter and
Apple's kit of international adapters for that. Does
anybody know which adapters will work in Argentina?
I've done some exploration on the internet, and some
sites maintained that either the 2-prong "European"
or the slanted-prong "Australian" should work in
most places, but then some other websites stated
that neither of these will work. Any experience or
suggestions? Thanks.