 If you've never seen them, it's a pheromone on a disc, and then there's a bag system attached to it. So it tracks them to the bag. They get in the bag. You throw the bag away. You're done. That's the concept behind it. Now, the debate is, is it bringing more to my yard than I would normally have? Probably. Honestly, probably, yes. So you want to place the bag or the whole system in the right area.