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Product was cheap and ineffective. The black light was indeed a black light, as opposed to fakes that just use a purple LED. That was ok, but the fan was noisy especially if on at night time. After 1 week the twist action of the lid became incredibly difficult to open and then the light just stopped working. Sent it back.
It works. I've had it kill 6-7 insects in a day. Its not 100% though. There's still a couple flying around but it does work to a certain extent. I've also opened it and seen a fly trapped alive in it. Closed back and the fly was dead the next time I open it. I don't find it noisy as I mainly run it during the day. If you don't close the top properly after opening the light won't work. After a few months of using it I've learnt how to close it really properly. If it doesn't turn on, most likely you didn't close it properly (it is very sensitive). But it works, maybe 80% efficient (I use it in a large hall so can't expect 100% coverage), I just put a few of these around the house. Don't expect 1 to do the job. Even those china brands also can't.