You Do Need power plug adapter while traveling from Dominican Republic to Christmas Island.

Here is Why You Need An Adapter

The outlet and plug type used in Christmas Island is I and in Dominican Republic are A, B and C. This is how they look like.

In Dominican Republic, outlets of type A, B and C are in use.

Type A

Type B

Type C

In Christmas Island, outlets of type I are in use.

Type I

I am from

going to