Who looks for a head massage device, will quickly see that the range of different devices is rather very rare. That is why I immediately took the 3 package to have a supply. For me, it took with the applications for a long time, until I come so clear that one should not always get goose bumps. Even madness, what are there in our head for nerves. Certainly comes the saying, "the nerves are with me." In the sense, I would argue, the nerves are still blank. Better it is only when someone else performs the treatment. This is on the scale of the price a real boon.