Rod electrode is primarily used to deliver a concentrated electrical stimulation to specific areas of the body, potentially offering benefits like localized pain relief, improved blood circulation, and skin stimulation, 
Potential benefits of a rod electrode in a violet ray device:
Muscle stimulation:
When applied to muscle tissue, the electrical current from a rod electrode can stimulate muscle contractions, potentially aiding in pain management related to muscle tension or spasms.
Acupressure-like effect:
When used on specific acupuncture points, a rod electrode may provide a sensation similar to acupressure, potentially offering relief for various ailments.