On the rear of the monitor, there should be a label on the back of the monitor that says what ranges the power supply will support. It will usually indicate that it has dual voltages, and in some cases, there may be a slider that you can adjust for one voltage or the other next to the physical power supply.
I don't have the specs for specific models outside of the U.S., unfortunately.
I am planning to buy a Samsung Monitor: B2430H. I live in Germany, but will move to the US next year. Does the monitor support both powersupplies 110 V and 220 V or if I buy in Europe it wont work in the US?