Yes E-Stim Stands for Electrical Stimulation... No you are not being electrocuted... you are though having your muscles stimulated by an electrical signal. This helps with inflammation, spasms, and blood flow helping to aid your body in a faster recovery. The TENS units are versions of E-Stim units as there are several types of electrical stimulation. We use the TENS units here at Mi Family and they are applied by the doctor and monitored by the technician or Tech CA. We look forward to helping you in the future with your health and wellness needs.