We have to start at the beginning. Do we on don't we accept the scientific fact that all 'matter' is nothing but condensed energy waves? I hope we do. Pity that the human eye can 'see' only about 0,1% of the spectrum.
These energy waves are vibrating at a certain frequency. A stone is vibrating, a tree, a quartz crystal is vibrating, the human cells vibrate, the parasites vibrate, we live in a universe of vibration. This is not any pseudo-science, it is a scientific fact proven in laboratories.
Bioresonance explained:
http://www.detaelis-international.com/index.php/answers/what-is-bioresonance
Every cell and thus every organ in our body emits its own distinctive frequency when healthy. If the frequency deviates upwards there is inflammation of the organ, if downwards there is deterioration of the functions of the organ.
What bioresonance researchers did, was to identify the frequency emitted by every parasite that can reside in the human body (we are talking about 0,01 Hz accuracy). They found that when you direct the same frequency on the parasite (virus or any other) itself, its cellular membrane brakes, by resonance. You can find many videos in youtube on braking glass with resonant frequency, to understand how this works.
Moreover they identified the healthy frequencies of our organs and can diagnose when an organ is dysfunctioning.
The actual frequencies are what is most important and not the device itself. Building a device that emits low frequencies is easy. Finding the correct frequencies took years of research.
As regards the fact that the company chose to sell their products through networking and not through retail stores, I find it a good choice, since your satisfied customers are the best salespersons for your product.
I can tell you that the device(s) have worked just fine for me. I have solved my constipation problem and forgot my lumbar spine pains. I met with holistic doctors that have cured more serious problems using the devices, but I can only state my own experience.
I present three photos, two from the manual of my device and one of the back of the device itself. As you can see, the fact that the devices can emit the claimed frequencies is guaranteed by the German factory. You can trust it or not. I was impressed to see that every device has its passbook, signed by the control technician that has checked it.