The Knight & Hale Heckling" Howler with Blasting Chamber volume and realism makes the barks and yips and howls while the Knight & Hale BT Prey Blaster makes the loud urgent distress cries of a wounded prey animal. These two great calls along with an instructional DVD that shows you how to use them are all you need to put a bunch of coyote fur in the shed. Locate them arouse their curiosity then call them in! Blasting Chamber Technology Heckling Howler for yips and howls BT Prey Blaster for distress calls Extra volume and realism Instructional and hunting DVD included