Don’t require power plug adapter while traveling from Guinea-Bissau to Switzerland.

Here's why you do not need an adapter

The outlet and plug type used in Switzerland are C and J and in Guinea-Bissau is C and they are compatible with each other.

Guinea-Bissau

In Guinea-Bissau, outlets of type C are in use.

Type C

Switzerland

In Switzerland, outlets of type C and J are in use.

Type C

Type J