At present, there are three kinds of electric voltage used in the world, which are 100V, 110 ~ 130V and three ~ 230V. 100V, 110 ~ 130V are classified as low voltage, such as the ship's voltage, so it is in accordance with the design of the device, the 220 ~ 230V is called high pressure, which includes China's 220 volts and 230 volts in the United Kingdom.