No offense but, why cant I just go to Radio Shack and put something like this together for $7.00 or so? It appears that with 3 AAA batteries and a couple wires I'll be good to go. I mean what more can that be? You have a switch, wires, electrode pads, and batteries. Maybe you have some sort of coil in there? I think I'll look into this. I can't see paying $336 for that though.