I blow into the hole in the can to make the bleats longer. I have called in a couple coyotes and this year I called in a large, hungry boar bear. He was none too happy when he figured out I wasn't his next meal. And I in turn was none too happy when I shot a foot and a halfto the left of his center mass. How someone can miss a charging bear with a muzzle loading pistol at ten feet is still beyond me[:@]