Apple has determined that, in very rare cases, the two prong Apple AC wall plug adapters designed for use in Continental Europe, Australia, New Zealand, Korea, Argentina and Brazil may break and create a risk of electrical shock if touched. These wall plug adapters shipped from 2003 to 2015 with Mac and certain iOS devices, and were also included in the Apple World Travel Adapter Kit.

These Adapters may be used in additional countries than those mentioned above. Check your adapter and if in doubt contact your local apple support team.

Apple three- prong Apple AC wall plug adapters recall

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Apple has determined that, in very rare cases the items above designed primarily for use in the United Kingdom, Singapore, and Hong Kong may break and create a risk of electrical shock if exposed metal parts are touched. This wall plug adapter shipped from 2003 to 2010 with Mac and certain iOS devices, and was also included in the Apple World Travel Adapter Kit

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These Adapters may be used in additional countries than those mentioned above. Check your adapter and if in doubt contact your local apple support team.

https://www.apple.com/support/three-prong-ac-wall-plug-adapter/