Guide to Electrical Equipment for Travelers/Plug adapters
These do not convert electricity. They simply allow an appliance (dual-voltage if necessary), a transformer, or a converter from one country to be plugged into the wall outlet of another country. Adapters sometimes do not make an earth connection, and so may be unsafe. For UK and Hong Kong natives and visitors, you can visit page Common electrical adapters in Hong Kong and the United Kingdom for adapters available for you.