You Do Need power plug adapter while traveling from Czech Republic to Puerto Rico.

Here is Why You Need An Adapter

The outlet and plug type used in Puerto Rico are A and B and in Czech Republic are C and E. This is how they look like.

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

Type C

Type E

In Puerto Rico, outlets of type A and B are in use.

Type A

Type B

I am from

going to