Arthur, I have been using the zappicator and Auto zapper for three weeks now. I have severe Rheumatoid Arthritis and have been confined to a wheelchair for three years after fracturing the third lumbar disc. My intention is to get out of the wheelchair and walk independently.  I use the auto zapper twice per day (2 – 30 min. sessions) and the zappicator once or twice a day (60 min duration each session). I can report that the damaged disc was extremely painful when i first used the zappicator on my lower back when I leaned against the box. It is no longer painful. I bought Dr. Clark’s “Cure For All Diseases” ten years ago and am a believer in her work.  MM