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Most new model flow generators have an automatic internal power converter. Most electronic devices are built to the specifications of the country for which they are designed, so an American electric shaver is generally designed to recharge on a 110V power supply because most American power outlets dispense that voltage. Other countries' voltages range from 100V to 240V. With a plug adapter, a flow generator can run on any of these power supplies, so the patient doesn't have to pack a separate power converter.