Found it catches common house flies. The main reason for my interest was if it would catch biting flies often called horse or deer flies which I found it did not work for me. Do not find the smell an issue like some report.
Takes a couple days to get up to maximum effectiveness and then 10 days later it is done. Not effective for the 30 day as advertised. If you plan right, place close to area you want to reduce flies a few days before the event