Depends on the country - Asia is a big continent.
This chart shows the voltages in use around the world:
http://www.kropla.com/electric2.htmYou are probably best off with a handheld receiver - virtually all of those have chargers that "auto-range" and just "do the right thing." Check your charger and make sure it says 100-240VAC 50-60Hz. If it only says 110VAC/60Hz then you will need a voltage converter.
You will need a set of plug adaptors, though. Radio Shack and other electronics stores carry them, and they are available online from many vendors.
Many great handheld receivers exist - depends on how small you want it to be, how many channels, etc. Hard to suggest what is best without more info.
-dave