TENS stands for (Transcutaneous Electrical Nerve Stimulation), which are predominately used for pain relief and the treatment of pain and nerve related pain conditions (acute and chronic conditions). TENS machines work by sending electronic stimulating pulses across the surface of the skin and along the nerve strands. The stimulating pulses help prevent pain signals from reaching the brain. Tens devices also help stimulate your body to produce higher levels of its own natural painkillers, called "Endorphins". We encourage you to read about How a Tens Unit Works to treat and relieve pain. Uses of TENS machine : Drug free pain management Easy to use, small & portable Does not cause drowsiness Non-invasive giving freedom to move and walk about Can be used for as long as required Can be used in conjunction with other prescribed drugs Digiten - II Is a TENS unit safe? A Transcutaneous Electrical Nerve Stimulation (TENS) unit is a device that sends small e