Electricity is 220V, 50 cycles AC.
For the most part, you can safely travel with
two types of plugs - two flat pins (like American
plugs, but without the ground wire) and three
pronged angled pins (like Australian plugs). Bring
along a 120V to 220V converter if needed, as they
are scarce here.
Conversion plugs are easily purchased
in China's major cities, but are more difficult
to find elsewhere. Battery chargers are widely
available. A torch (flashlight) is useful to take
along in case of blackouts.