Judaica Protective Jewelry

[RadCazz]

With what's been going on in and outside my life, I felt particularly drawn to this Mezuza/Kabbala Pendant (see attachment).  Supposed to be for protection and to ward off the "Evil eye."  Don't know much else about this item in particular, partly because I was raised Roman Catholic.
Anyone know more about this?  Does anyone believe in the benefit of such things?