The battery did not work on the first device. Replacement device works, but is not ideal as high pressure triggers the vibrations. This doesn't work with muscle pain...
The machine is too loud and to start the massage function it has to be pressed on with a lot of pressure. The vibration is too coarse and difficult to control. The cooling function is even louder, the heating is so-so it gets warm. Tried it out and returned it. Overall, far from what I expected.
Small and yet good
Simply massage