I cracked open my box of tricks and had to take a gander to see if I could be any better in helping you answer this question.
On the bottom of the wand near the cord there is a little sticker. This sticker says, "AC 100-240V 50/60Hz 15W 20(then some Chinese characters)". So the answer is YES. You can use this in Australia. But you would need to get yourself a plug adaptor as the plug is a typical North American style.
If you are thinking of collecting lots of toys and possibly getting some rechargeable ones, (all the toys I've picked up have been internationally useable) BUT, because Australia has a different style plug than most of the rest of the world, you might be interested in picking up a universal power bar.