The electricity in mainland China is generally 220V, 50HZ, AC (Hong Kong is 200V; Taiwan is 110V).
Most of the hotels in China have both 110V and 220V electrical outlets in the bathrooms, though in guest rooms usually only 220V sockets are available.
As the shape of a socket varies between countries, to carry your own portable plug adaptor may be convenient. Find the adaptor that can be used in multiple countries for your convenience. Such adaptor can be found in China at a very inexpensive price.
Adaptors can be purchased from travel stores or electronics stores in your countries. In China most hotels provide the adaptors free for use. So you do not have to take an adaptor with you when travel to China from USA. Most American cameras, laptops, and other electronic devices with 2 plug-in legs connect to all the sockets in China without any problems.
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