The mouthpiece on the Rocky Mountain® Stealth Yipper Yapper Call features narrow reed, plastic barrel, the tone cap and automatic Lip Positioner. Place fingers over the holes while blowing. This will change the pitch to a deeper sound and less volume. Remove fingers from the holes and the pitch will be higher with more volume. Makes a variety of prey sounds, juvenile barks and howls including baby jack, baby cottontail, distressed fawn, distressed canine and rodent squeaks.