the symbols on the charm do no correspond, as far as I can tell, to any of the charms or talismans form in the Key of Solomon, although some of the texts for other charms sold by this company do seem to match up (but not the designs)
The charms could have been designed based on information received in a seance or some other mystical ritual, but it does not otherwise seem legit.
As with other things of this nature, the effectiveness seems to be rooted in the faith you put in the charm in the first place.
This amulet is divided by eight spokes which symbolize the infinite power of God.
On the right side of this amulet the characters TR standing for the word Trisagion (= three times holy) can be seen.
The diagonal spoke with an arrow at the one side bends like a vine on the other and thus symbolizes life and health.
The horizontal spoke standing for the human powers of comprehension is crossed on the left side by three vertical lines. These three lines are a symbol for the Trinity which is effective as a divine power in the external material as well as the internal spiritual world.
The letters A and M on top of the pendant mean Anno Mundi signifying as much as "since the beginning of the world".
Hence, this amulet as a whole symbolizes that God in his threefold being of Father, Son and Holy Ghost watches over its wearer since his birth.
This old amulet originates from the "Key of Solomon" - in medieval times this charm has been extended using Christian symbols.
According to old beliefs this medieval fortune charm should make it much easier to get rid of bad habits, to overcome mental troubles and dark thoughts and to sustain health by defeating addictions of all kind.
Among other things medieval knights of the 16th century wore this pendant not only as jewelry but also as an aid to achieve changes in their lives.
This magic amulet was very popular because according to old belief the correct choice of symbols and materials was everything needed for this kabbalalistic pendant to work and therefore it was not necessary to charge it.
Note that the 16th century was not the medieval period.
Some of the other amulets in this series are attributed to the Knights Templar on other websites
most likely the designs are mostly 20th century inventions