The TENS+Heat Conductive Back Wrap Systemprovides electronic nerve stimulation to stimulate healthy muscles in order to improve and facilitate muscle performance. It is used for temporary relief of pain associated with sore and aching muscles in the back. There are two temperature level heat therapy options and 3 settings: TENS+heat, TENS only, heat only. It has secure, magnetic connectors. 1) 8 – Pulse Modes & 20 – Intensity levels, 2) Gel-stlye, electrode pads,and re-usable elctrodes, up to 50 uses, 3) 10-60 minute programmable sessions; autonatic shut-off, 4) Single channel output, 5) Rechargeable internal battery.