You Do Need power plug adapter while traveling from Vatican City to Trinidad & Tobago.

Here is Why You Need An Adapter

The outlet and plug type used in Trinidad & Tobago are A and B and in Vatican City are C, F and L. This is how they look like.

In Vatican City, outlets of type C, F and L are in use.

Type C

Type F

Type L

In Trinidad & Tobago, outlets of type A and B are in use.

Type A

Type B

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