Injuries caused by car, motorcycle and bicycle accidents may cause pain and discomfort in your neck, upper back, mid back, lower back, face, jaw, nerves, wrists, tendons and muscles. So, over 1 million injured people per year, who suffer from pain, both acute, traumatic, post-surgical and chronic choose Transcutaneous Electrical Nerve Simulators (TENS) to reduce pain without the adverse side effects of prescription medications.