Strong massager against tension and back pain

Once a relative has recently seen a similar massager with me, he wanted to also have one thing. This (a MG 48) was unfortunately not available for some time, so he finally decided for this product.
My relative needed a device that helps in severe back pain, and that it can also apply unassisted. For this purpose it this massager quite good, as it has a very comfortable handle, which can be removed as needed.

How strong is the massage, can be determined via a continuously variable wheel, also infrared heat can be switched on, but not as strong impact such as an infrared lamp.
Who is constructed very tender, the knock function but could perceive as too strong, especially in the area of ​​the shoulders and spine. Therefore, very slender, fragile people should consider whether a weaker massager would be more appropriate for them.