I set two traps up near the spot that I would do the grilling this past Fourth of July Weekend.  This stuff really works.  It is quick to set up and doesn't have any unusual odor for an  outside product.  I could also detect that my two fly traps may have benefitted my neighbor and his outdoor grilling.  He did not have any flys to have to contend with.  I will be ordering a lot more of this product, in the near future.