Voltage and Frequency
China: 220V at 50Hz. US/Japan: 110V/60Hz.
Plug Types
Type A (two flat pins) and Type I (three flat pins).
How to Check
"100-240V, 50/60Hz" = universal voltage, just need a plug adapter. "110V" only = need a transformer.
Choosing a Transformer
Transformer wattage should be 1.5 times the appliance's wattage.
Buying Appliances in China
Buy small appliances locally.
USB Devices
Phones, tablets, laptops are usually universal voltage β just need a plug adapter.