Sockets used in Mainland China:
Type A and type I. The type A can also accept plugs of type C or F, which are commonly seen in most European countries.
 

Type A: In China, this kind of outlets has two holes of the same shape and size. Plugs that match this socket are commonly used in US, Mexico, Canada, Japan, Philippines, Colombia, Thailand, Vietnam, Panama… But you should notice that there is a kind of two-blade plug with one end larger than the other. They can't be used in China without an adaptor.

Type I: Countries like Australia, New Zealand, Argentina, and Fiji use electronic devices of this plug shape. Sometimes, the blade at the top is missed, but it can still function safely in Mainland China.

Type C & F : This kind of socket is widely seen in most European countries, like Russia, Germany, Denmark, Poland, Finland, France, Sweden, and Spain, as well as South Korea.
 

Sockets in Hong Kong, Macau and Taiwan
Hong Kong, Macau and Taiwan use different socket types from the Mainland China. In Hong Kong, British Standard outlets, also known as type G, are widely used. People coming from countries like UK, Ireland, India, Malaysia, Singapore, Maldives, Nigeria, and Uganda can charge most of their electronic devices without an adaptor in Hong Kong. Type C or F is the universal socket in Macau while the plug shapes of type B can be well compatible with the outlets in Taiwan.

---

Electricity Voltage around the World