You Do Need power plug adapter while traveling from Balearic Islands to Cameroon.

Here is Why You Need An Adapter

The outlet and plug type used in Cameroon are C and E and in Balearic Islands are C and F. This is how they look like.

Balearic Islands

In Balearic Islands, outlets of type C and F are in use.

Type C

Type F

Cameroon

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

Type C

Type E