What is TENS? TENS stands for "Transcutaneous Electrical Nerve Stimulation" – a safe, non-invasive, d rug-free method of pain relief used by therapists and prescribed by doctors for over 30 years. Most users’ feedback show that it is a really effective pain management tool. Chosen by sufferers of neck pain, back pain, shoulder tension, tennis elbow, carpal tunnel syndrome, arthritis, bursitis, tendonitis, plantar fasciitis, sciatica, fibromyalgia, shin splints, neuropathy and many more injuries and disabilities. Function: 1. For arms pain, legs pain, shoulders pain, neck pain, waist pain, back pain ect. 2. Muscle relaxation 3. for neck shoulder back arm leg foot Massage DO you have these troubles? aintaining a posture for a long time or fatigue, stiffness, and other discomfortcaused by muscles such as shoulders, necks, and waists caused by exercise. If it isnot resolved in time, serious back ditch will occur.