Eric you can order them on amazon there's 2 different kind there is a red and white one and a black one I have the red and white one it works good but in my experience the yotes have to be with in a few hundred yards to answers it the black ones is supposed to be louder
Thats the one I have. From my experience its more like 3 to 400 yards . I 've never had any to answer that was any farther than that . But good luck and happy hunting