It works well for the first card, but then the bus stopped working and added a comment.

If you warm it up before stretching, the range of motion will expand and the pain will be reduced.
I'm holding back from feeling comfortable and falling asleep because there's no timer function.
It can raise the temperature quite a bit, so if you sleep with it on, it might get too low.

My mother likes it.

The device is easy to use and reduces knee pain to a significant extent.

Seems very good, a bit troublesome to fit on elbow since but gives good heat and vibration