I am satisfied that the device is bigger than I thought and the build is fine.
It was supposed to be a strong physical vibration by supersonic beer bubbles, but if you put it in a beer, you will not feel any movement unless you put it into operation. However, when put in a beer, it worked well to produce tight bubbles. There is an engraved mark on the location where the power button is touched. I think it is a good thing.