I know this gadget has a lot of positive reviews, but I was totally gobsmacked by how well it worked for me. We have a large yard, half wooded, half grass. We hung this at the border between the two areas. It must be a sweet spot because it seems to have almost totally eliminated mosquitoes in the grassy parts (we don't go back in the woods much). It probably ran 3 days before we got out in the yard, but that was long enough to clobber the bugs. My wife and I are amazed.