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

Here is Why You Need An Adapter

The outlet and plug type used in San Marino are C, F and L 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

San Marino

In San Marino, outlets of type C, F and L are in use.

Type C

Type F

Type L