Had the opportunity to try this over the weekend. A spike walked in and roamed the area I was hunting. He eventually got to the trail I walked in on and caught my scent. He blew twice and trotted off then I blew at him once and never heard him or saw him again that afternoon. Not sure if it helped or not, but it got him to shut his trap! Every deer that's blew at me has at least blew 4 or 5 times.