1. National standard plug is used in China, Australia, New Zealand and Argentina, characterized by three flat heads;

2. American standard plugs are used in the United States, Canada, Japan, Brazil, the Philippines, Thailand and other countries and Taiwan, characterized by one circle and two flats;

3. British standard plugs are used in Hong Kong, Britain, India, Pakistan, Singapore, Malaysia, Vietnam, Indonesia, Maldives, Qatar and other countries and regions, characterized by three sides;

4. European standard (German standard) plugs are used in Germany, France, Netherlands, Denmark, Finland, Norway, Poland, Portugal, Austria, Belgium, Hungary, Spain, Sweden and other European Union countries, as well as South Korea, Russia and other countries, characterized by two round heads;

5. The South African standard plug is mainly used in South Africa, India and Russia, characterized by three round heads, Italian standard (Italian standard) plug, Swiss standard (Swiss standard) plug, etc.