Loc: Paradise....on the central Ore...
That indication of input -vs- output voltage is normally found on the charging unit itself......so for either the iPhone or iPad, it wouldn't be on the device, but rather on the charger that actually plugs into the outlet.
In very faint low-contrast lettering on the Apple 10W USB power adapter (model A1357) it says that the input voltage range is 100-240 VAC at 50-60 Hz drawing 0.45 Amps and output voltage is 5.1 VDC yielding 2.1 Amps (10 Watts)....so I think that your challenge is limited to finding the correct physical connector.
_________________________ Freedom is never free....thank a Service member today.
Lee's right on: the iPhone/iPad/iPod power is regulated via the respective power adapters, and (like Macs) these are rated for 100-240V, 50-60Hz. I used my iPod Touch in Europe with both the Apple and a Griffin power adapter and the proper local power plug adapter. No problems.
DK is probably right about that Apple kit being overpriced, but that's in part because it contains items you may not need. If all you need is power plug adapters, those are usually about $1-4 apiece (see here for examples).
A standard 'world' assortment of such adapters together with a power converter for 'domestic appliances' is available for about $20-40 in places like Radio Shack etc. A potential issue with the 'world' kits is that there's only one of each adapter type, and you may need more than one at the same time. Something to figure out before you leave, I guess.
I recommend using the adapter kits that merely provide you with a different shape plug. You can continue to use your white brick, it just needs to be physically compatible with the outlet.
Those converters are becoming less and less useful, and have a nasty habit of burning out electronics due to their really nasty power regulation. They're usually also very low power.
Just read the fine print the UL requires to be on the adapter. It should say "110-220 (or 230)v, 50-60hz" on it. If it does, it works on any power in the world, so long as you can find a way to plug it into the outlet.
I work for the Department of Redundancy Department