Residential Mains electricity in China is 220 V at 50 Hz (Frequency)
Plugs: A (NEMA 1–15 U.S. 2 pin), I (3 prong), C (CEE 7/16 Europlug)
Many home appliance vendors manufacture products for specific markets, meaning that you need to purchase for that specific market of intended use. Most computer companies have a built in transformer, so that you can use the product in different markets.
It is possible to get a voltage converter, but they typically do not change the frequency, so are not exactly a perfect solution. It is possible to get voltage and frequency converters but they are typically not for consumer markets.
“…products offered in the U.S. and Canada are designed for a 120 volt / 60 hertz power system. If you use them with a voltage converter to change your 240 volts to 120, the converter will not convert your 50 hertz to 60 and the motor will run slower and hotter than it should. This will cause premature failure of the motor and this is not covered by the warranty.”
This Fan costs about 100 dollars in North America – about 1000 dollars in Shanghai.
“A power converter would be needed to use the machine in different countries; and we do not recommend using a converter, as it will damage the motor. ”
This fan/air purification system costs about 300 dollars in North America – about 1000 dollars in Shanghai.