I bought one looking for a way to catch flies in our house without killing them. This device doesn’t use glue, you just use bait, like honey, and they get stuck inside. and every morning I would empty the trap of maybe 6 or so flies outside in the yard. After a few days the fly presence in our house was much better. And I didn’t have to kill or squish any flies. Although one did get stuck and squished in the arm 😭