Transcutaneous Electrical Nerve Stimulation- Physiotherapists and professional doctors have been using a safe and non-invasive pain relief method for decades! TENS is the current electricity generated by the device used to stimulate nerves for therapeutic purposes. If you have back/shoulder pain, chronic pain or muscle pain, you can choose your favorite mode to customize your exclusive massage. Compact size will fit into any jacket, coat or pack pockets, convenient for you to carry and enjoy any