Have I bought this unit because of my acute neck tension, which drew strong migraine with it. Generally, I have a number of strong deficits in orthopedic area. I've read that says it is this device and it can not confirm. The device has a decent comfortable listening level, and is much quieter than a hairdryer. The vibration level, the knocking can be adjusted with a knob wheel well while applying for his needs. After 10 min. Application complaints with me can gradually you realize the same improvement of the problems.
I highly recommend this unit with a clear conscience!