You Do Need power plug adapter while traveling from Palestine to Syria.

Here is Why You Need An Adapter

The outlet and plug type used in Syria are C, E and L and in Palestine are C and H. This is how they look like.

Palestine

In Palestine, outlets of type C and H are in use.

Type C

Type H

Syria

In Syria, outlets of type C, E and L are in use.

Type C

Type E

Type L