This easy to use, analogue TENS machine offers natural, non-invasive pain relief without the use of chemicals or drugs. Transcutaneous Electrical Nerve Stimulation (TENS) delivers tiny electrical impulses to the nerve fibres that lie underneath the skin’s surface, providing pain relief by blocking pain signals to the brain via the spinal cord and peripheral nervous system. Analogue Kit includes: 1 x TENS machine unit 1 x D size 9-volt battery 2 x electrode leads 4 x self adhesive electrodes (pack of 4) 1 x instruction manual 1 x hard plastic carrying case