I initially saw it at my dentist.
I bought it at a much higher price.
It is the most reputable company in the field.
At the current price, it's a steal from a homeless refugee who hasn't eaten for a week. And you snatch the sandwich from their mouth.
I have bought one for each member of my family and we use it daily.
Maybe it's not unrelated that neither my wife nor I have gotten sick.
Of course, we are careful and take all necessary precautions.
But for mobile phones, keys, food items, it is the quick solution.

It doesn't kill covid (that's why I bought it), it kills e-coli and staphylococcus.
It seems to emit light but you can't check if it actually does what it claims, you have to rely on good faith.
I wouldn't go crazy to buy it again.