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https://altered-states.net/barry/bobbeck/differences.htm
Ron

[snippet)
In any event, to get back to the task at hand, how do these devices differ and do you need to use all three of them? In short, they are different in major ways and, Yes, you do need to use them all to be more effective in eliminating parasites of all types. The Zapper kills by passing an electrical current through the body. Electricity travels on the surface of muscle tissue and will not penetrate the body like radio waves or x-rays do. Therefore, there are large areas of the body that the current cannot reach, making it ineffective in eliminating parasites in those locations. Areas such as the contents of your stomach and your intestines, your sinus cavities, parasites inside gallstones in your gallbladder and/or liver, and the blood stream and lymph tend to be impervious to the Zapper. Unfortunately, large numbers of parasites live in all of those areas. So you need different devices to reach different areas.