CDJ 2000 Nexus Japan to Australia plug

I have just bought 2 CDJ 2000 Nexus units refurbished from Japan and am using them in australia, the units are coming with 220v power chord. I have been reading up about whether i will need a step down transformer or not, it seems a lot of these units can be multi-voltage, but i want to be sure. I have attached a couple photos of the unit, on the back it says it is 220-240v, however the power is two pronged, i am used to 3 prongs in the power sokcet on the units in australia. Does this mean it is infact 120, or can 240v be two pronged. Your help would be much appreciated, i am worried I will blow the units when i use them.