The national standard plug is used in China, Australia, New Zealand and Argentina. It is characterized by three flat heads.

American Standard plug in the United States, Canada, Japan, Brazil, Philippines, Thailand and other countries and Taiwan, is a circular two flat.

British plug used in Hongkong and the United Kingdom, India, Pakistan, Singapore, Malaysia, Vietnam, Indonesia, Maldives, Qatar and other countries and regions, is three square.

The European standard (German standard) plug is used in Germany, France, Holland, Denmark, Finland, Norway, Poland, Portugal, Austria, Belgium, Hungary, Spain, Sweden and other European Union countries, as well as Korea, Russia and other countries, with the characteristics of two round heads.