I tried a different brand with a black light. Took it back to a local lumber company/hardware store. It did not even attract bugs. This one us a bug-killing machine. Constant zapping all night long. I put it on a dawn to dusk timer and it literally zapped without stop. Not sure about how well it will work on mosquitoes as I live in Oklahoma and here you need Lurex3, not Octenol. I put the packet in anyway. Understand though, I did not buy it for mosquitoes. I have a "M-Magnet" for that. I bought this for the sole purpose of attracting the flying insects that plastered my window and door, to keep them away from it so I can enter and exit without hearing the ball and chain complain that I let bugs in. This worked so well that I kept the patio light on, sat on the patio for two full hours last night, and did not have one bug buzz me. I would buy it again!