You Do Need power plug adapter while traveling from El Salvador to Namibia.

Here is Why You Need An Adapter

The outlet and plug type used in Namibia are D and M and in El Salvador are A and B. This is how they look like.

In El Salvador, outlets of type A and B are in use.

Type A

Type B

In Namibia, outlets of type D and M are in use.

Type D

Type M

I am from

going to