Melody,
They actually have the machine you are talking about : http://www.findhealer.com/mall/telstar/Q003.php3

And..to follow Glenn, I have used the tens. But I used it for fibromyalgia related muscle pain. The way it was explained to me in very simple terms is that the stimulation of the tens pulsing shock sorta fatigued the nerves and they would shut down for awhile after this happened. The downside of the machine is that my body gradually got used to this and started moving the pain around to other areas. Then if I quit using it for awhile, then started using it again, it would work again. I used this machine for years. And I have recently purchased one on line.

Billye