You Do Need power plug adapter while traveling from Abu Dhabi to Cocos (Keeling) Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Cocos (Keeling) Islands is I and in Abu Dhabi is G. This is how they look like.

In Abu Dhabi, outlets of type G are in use.

Type G

In Cocos (Keeling) Islands, outlets of type I are in use.

Type I

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