The Silva “Mini” whistle is designed to be your back up or emergency Whistle, it attaches to your Key Ring and is there for the times you leave home and forget your Silva Whistle or when your hunting other animals apart Foxes and you see an area that you think you would like to whistle. You just reach for your keys and bingo you have a whistle in your hand. Because of its size, it is slightly harder to use and it’s not quite as loud but works extremely well and will pull foxes from quite a few hundred meters some hunters actually prefer the “Mini” because of it is very small size