Don’t require power plug adapter while traveling from Guatemala to Guam.

Here's why you do not need an adapter

The outlet and plug type used in Guam are A and B and in Guatemala are A and B and they are compatible with each other.

Guatemala

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

Type A

Type B

Guam

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

Type A

Type B