Beurer EM 38 TENS Belt is a TENS machine designed for the management of back pain. Its unique belt like shape with Velcro fastening enables you to deliver TENS signals precisely to the area in need of pain relief. The Beurer TENS Belt EM 38 is adjustable with Velcro fastening, which ensures perfect body fit and good contact between electrodes and your skin. The electrodes are built in and you will never need to replace them. To improve conductivity, simply moisten your skin with water.