According to Apple, the affected wall plug adapter may break in rare cases and the exposed metal parts within it could cause electrical shock when touched. Here is how the affected plug looks like as compared to the newer model:
The company also stated that this particular wall plug adapter was shipped from 2003 to 2010 with Mac and iOS devices. Alternatively, it can also be obtained as part of Apple World Travel Adapter Kit. To learn more on how you can further identify the wall plug adapter as well as getting it replaced, head on to Apple’s official website.