I use a tens unit but I have chronic daily headache and Migraines. Due to these I always have a lot of tension in my neck and shoulders and so I place the pads on muscle area, and I use it for 15 min with ice. When I was going to the chiropractor they were using them and I asked about it, the told me I could buy it online. I bought mine at amazon.com for $36.00 plus I bought extra pads. because those will wear out after a while. It just helps relieve some of the built up mulsle tension from chronic pain. Going for a massage would be even better, but since I can't afford that, this does help.