You Do Need power plug adapter while traveling from United Kingdom (UK) to Marshall Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Marshall Islands are A and B and in United Kingdom (UK) is G. This is how they look like.

In United Kingdom (UK), outlets of type G are in use.

Type G

In Marshall Islands, outlets of type A and B are in use.

Type A

Type B

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