Don’t require power plug adapter while traveling from Tonga to Vanuatu.

Here's why you do not need an adapter

The outlet and plug type used in Vanuatu is I and in Tonga is I and they are compatible with each other.

Tonga

In Tonga, outlets of type I are in use.

Type I

Vanuatu

In Vanuatu, outlets of type I are in use.

Type I