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

Here is Why You Need An Adapter

The outlet and plug type used in San Marino are C, F and L 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 San Marino, outlets of type C, F and L are in use.

Type C

Type F

Type L

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