@Dancingmidwife
@Bob may be able to help you understand the advantages of the C5 vs the M1 vs the Intellibio machine, vs the Sana shop devices.
I can give my two cents if you’ll take it. At a cursory search of Intellibio, and the Sana devices, I’m fairly sure that they are (or are highly based/similar) to a device known as the Scenar. Scenar was supposedly invented by the Soviets, for cosmonauts in particular. You’ll notice these devices mention that they use skin impedance for bio-feedback communication with the body, in which they send some electrical current into the body to provoke a response, and then receive a response back from the body in order to decide whether to continue sending signals or stop. The impedance of the skin is supposed to change based on the current state of the organ or target area in the body you are targeting. This is mostly based off of reflexive zones and meridians. I will link a paper on this technology at the bottom of this post. This communication between the device and body stimulates a response from the body that is supposed to bring healing to a particular area. I haven’t tried it myself but have been thinking about purchasing one of these devices for about $250/300-$500 and trying it for myself, so I can’t comment on the effectiveness of it. The Scenar devices are cheaper if you buy the Russian models. I can say that it does seem to be the case that the former Soviet Union as well as current Russia is very progressive in bio-physics and have a lot of interesting innovations.
If you haven’t read Jerry Tennant’s “Healing is Voltage”, it’s a good read on how to understand the body in terms of physics and electricity. He has his own version of the Scenar device, which is fairly expensive.
Link to a document describing the Scenar technology: Scenar Explained