I've always had serious problems with headaches, due to stress at work. Since I use this instrument every day, I sleep better, feel better and concentrate more easily at work.

10 years ago I got this similar instrument from my friend who is a doctor and I used it almost every day and this sound has a very good effect on me.

This is my second product from this company. Just as good on the quality. Good sound and holds it for a amount of time.