Whilst I could not find anything about it on any of legitimate review sites, I did find this shonky “advertorial” which has many real reviews at the bottom of the page.
From what I have read, the female mosquito which are the ones out to get your blood, are not all that attracted to UV light.
So dubious that any zapper device would work. Maybe get a few, but more likely lots of other insects that are attracted to light.
I wouldn’t expect much for your money.
I know what does work. Good repellent like Rid. Used that all the time when in QLD from when I was a kid.