I bought a 30KHZ zapper and a Rife machine. they are wonderful but they are not the full answer.
The reason why I did was because I did the research on how it works and why it works.
I do not and would not buy a zapper based on the sellers claims unless they give me the specific details of construction. Sellers claim lots of things but they aren't any more valid than the government telling me vaccines are good for me.
The government and big pharma fakes data and twists facts all the time. What would make an individual seller more believable? Nothing.
Paraphrasing Carl Sagan: We are a technology dependent society that knows nothing about technology and we are headed for disaster.
In other words we are all lazy saps that aren't willing to study and understand what we use and why we use it. we just want to be spoon fed so we don't have to think.