I no right. Every single hunting video you watch they use calls and they work great but I can never get them to work that well or at all. I have a "can" and when I see a buck that is to far a away to shoot or is walking away I flip that "can" over but all the bucks do is turn there head around. However, this year I have found something that works well. During bow season I had a nice sized 4 pt come walking in about 40 yrds from me and he was walking away. So I grabbed my "can" and flipped it over but all he did was pick his head up and look over to where I was in my stand. He didn't see me but he just walked away. So I thought to myself, Why don't I take my 3D bow target (River Bottom Buck) and take the antlers off and put it out at my treestand. So I did that and sure enough a few nights later a small 3 pt walked in not seeing my decoy (target) and I reached for my "can" and as soon as i flipped it over he looked over my way and saw that decoy there and walked in to about 15 yards from me. Now I have found that to work good for the bucks but when I put that target out there especially with some tinks the doe that come to my stand do not stay very long because they don't like my target. So there is my little secret i found this year.