Just saw a post asking about where to get a tens unit. You have to get a prescription from your Dr be sent to PT where you are showed how to use the unit. If it works for you, most insurances will buy the unit. They rent it first then after a time it becomes yours. Lordy! That sure sounds like rmbling. Oh well it is past my bedtime. Besides you get the idea! Right? Hugs Juanita CG for George 74/71/64