You Do Need power plug adapter while traveling from Saudi Arabia to Niger.

Here is Why You Need An Adapter

The outlet and plug type used in Niger are C, D, E and F and in Saudi Arabia is G. This is how they look like.

Saudi Arabia

In Saudi Arabia, outlets of type G are in use.

Type G

Niger

In Niger, outlets of type C, D, E and F are in use.

Type C

Type D

Type E

Type F