The chargers are a switching type power supply and out of the box are capable of between 100 and 240 volts. They are terminated in the north american two prong flat blade power plug, and with the use of a good quality travel adapter, they can be connected to other 220/240 style receptacles. If you don't have a travel adapter or wish to make the conversion permanent, you can simply cut the plug off and replace it with the corresponding plug of choice; the polarity doesn't matter as the charger is an isolated and ungrounded type.