You Do Need power plug adapter while traveling from Hong Kong 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 Hong Kong is G. This is how they look like.

In Hong Kong, outlets of type G are in use.

Type G

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

Type C

Type F

Type L

I am from

going to