I bought this indoor trap, together with an outdoor trap from the same brand, in a 2-pack from Costco two years ago. Two and a half summers later, it has never caught a single mosquito! A few moths, that's it. I followed the instructions closely and left it 24 hours a day in the summer days. The outdoor blue-light trap did kill a few mosquitos but not nearly half of them IMHO. This indoor trap is marketed on a heap of lies. It just does not work. Last week the fan stopped running so I threw it away.