You Do Need power plug adapter while traveling from Cocos (Keeling) Islands to Côte d'Ivoire (Ivory Coast).

Here is Why You Need An Adapter

The outlet and plug type used in Côte d'Ivoire (Ivory Coast) are C and E and in Cocos (Keeling) Islands is I. This is how they look like.

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

Type I

In Côte d'Ivoire (Ivory Coast), outlets of type C and E are in use.

Type C

Type E

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