First i doser works very well but you should know how to enter a trance state (try practicing meditation) once you know how to enter a trance state you can play any dose that i doser did (because they are the only company that you can trust) and trust me you would feel the effect of the chosen dose but i am not saying from the first time you should know that it needs time and practice but I'll say this in the end it will work for you and I'm definitely saying that you will fall in love with them and you would definitely thank i doser for there work plus there prices are very reasonable and well studied let's take an example they offer you 20 dosses for free for only 5$ that is pretty much a good deal (i doser app).