You Do Need power plug adapter while traveling from El Salvador to Solomon Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Solomon Islands are G and I and in El Salvador are A and B. This is how they look like.

In El Salvador, outlets of type A and B are in use.

Type A

Type B

In Solomon Islands, outlets of type G and I are in use.

Type G

Type I

I am from

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