Product has described. The quality seems enough good.
It looks pretty good, especially the glass part, and works alright on rechargeable batteries. Sound activation is sensitive enough to be usable. Still, there is noticeable coil whine, but very high-pitched so some people (with old or damaged ears) might not hear it. I can get used to it as it is a continuous sound, like a CRT TV flyback but even more high pitched. I don't suppose much can be about it though, as it obviously needs high voltage, and getting rid of coil whine is rather difficult.