You Do Need power plug adapter while traveling from Nigeria to Equatorial Guinea.

Here is Why You Need An Adapter

The outlet and plug type used in Equatorial Guinea are C and E and in Nigeria are D and G. This is how they look like.

In Nigeria, outlets of type D and G are in use.

Type D

Type G

In Equatorial Guinea, outlets of type C and E are in use.

Type C

Type E

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