That MAY be all you need, you need to check the power supply and look for it to say

Input 100-240 V 50/60 Cycles

If it just says Input 110 Volts, do not plug it in without getting a step down transformer to bring the 220 to 110 or it will catch fire. If it says 100-240 then it's fine.

If you need a power converter, they are under $20 at Radioshack for the ones you need.