The voltage is determinned by the transformer turns radio; the frequency (50Hz or 60Hz) can be changed in the firmware. 60Hz is standard in North and South Amarica, 50Hz the rest of the world. Examples of supply voltages: 100V (Japan), 110V (USA), 220V (Ukraine and China), 230V (UK, EU, Most African countries including Burkina Faso), 240V (Australia).