After 2 months of use, it works flawlessly (of course, I don't know if it actually kills bacteria) but so far I haven't had any functional issues. A very good purchase for a small amount of money.

It has an Hg lamp and indeed produces uvc ~ 250 nm, but from various comparison videos on YouTube, it seems that 1) the intensity of the radiation is very low and 2) the intensity in the vertical direction is almost zero, which makes disinfection difficult, for example, of a mask. On the positive side, it has an audible end notification, so you don't risk looking at the lamp while it is operating

It seems to work, now whether it sterilizes is another story that I have no way of checking. This model has an electronic source for the sterilization frequency, unlike another model that has a lamp that emits ultraviolet light. Which one does the job? I will come back when I open a biological laboratory...

Easy to use and effective for simple everyday use. The only negative thing I found is that the quality of the plastic is not good.

Not at all good quality, full Chinese. I'm not even sure if it sterilizes and it just emits a blue light that is supposed to be UV