Love my TENS also. Now, my chiropractor states the new therapy is heat and not ice and explained why. I understand. Years ago that worked great. At times at home yes but more so ice. So I asked my two doctors their opinion (not to go against my wonderful chiropractor), what they thought. Ice is find. What he said is true but if ice works, it is decreasing the nerve pain. That is why I am getting relief. Yes the heat is ridding the body of all the wastes and toxins that increase pain but use ice if it works better. So, when he works on my back, I prefer heat to rid the toxins. At home with my TENS and just during the day or sleep when pain,,,ice.