I am trying this after reading product info and reviews and I am more impressed and glad to have this machine than i expected to be. I wish i knew more about the science and if anyone does i hope they share that. What i do know is that i was experiencing a huge amount of discomfort in leg and foot after having a spinal fracture ..but also after dropping something heavy on foot so not sure of real cause of the sensation of super sensitive nerves close to the skin ...some describe it as burning but to me is more like stinging ...and almost all the time...and in leg also...and is commonly diagnosed as nerve degeneration. I am doing all kinds of other things but this feels so amazing and brings so much relief and feels like it could possibly reverse the damage done to nerves and help them recover. If it does that it is worth it's weight in gold but for now science doesn't seem to know for sure ...only that it helps relieve symptoms. Symptom relief alone though can help the body heal much sooner and better so i am happy with that. The machine has such a huge variety of options for pulsing frequencies through your feet and legs and each one feels very different than the others. (Another advantage of this...is all the options to play with and how much each provides a different feeling and kind of relief) I love it and while there was one concern i took up with the seller ...the person did finally resolve this with me extremely fairly and all is well. They offered a return but i want to keep this , i like what it is doing and extremely glad i tried it out...so we found a resolve for the one thing i did have a tiny bit of issue with and now it's all resolved and i have none. That speaks well too for the seller and so i encourage others who are interested in this to give a good try. then instruction manual is well done and easy to read and thorough. and the machine is to me a blessing. Please note though that it does not provide an infra red technology so if the ad does say that , realize it is an error (unless same item by a different seller does have that ) and do not expect to get the infra red feature. But what it DOES provide is definitely worth it and definitely has a very big impact. In fact i am still using it at very much lower levels ...and experiencing so much so for someone else there is so much more potential if needed. You set the level of impact of the machine you want and you build on that as you get used to it. It is really quite extraordinary and while i say i wish there was more known scientifically...if you do some research like i did, it is showing very consistent and favorable results for large number of people and people have reported very specifically what that is for them ..so i was sold on at least trying it...and i am so glad i did. I haven't used it long enough or anywhere near long enough to report results other than relief it brings but i expect i will have more to report after use it enough . You can also research TENS and EMS for nerve stimulation and muscle pain etc. but as i said if it lists infra red technology as a feature ...it did not actually have that so check with the company on that before purchase. hope this helps. i do love this machine and love what my feet and legs feel when use it. it is deeper than any massage and does in some ways stimulate nerves in ways massage cannot...whether by hands or other kinds of massage technology. these sends sensations deep into tissues and muscles. You have to try it to know what it is and does.