You may not realize it, but does actually make a lot of noises, including grunts. The bleat is unmistakable. Generally lasting a few seconds, the doe bleat makes it clear: She's ready to go.
Make either doe and estrous bleats with a quick O-ring change
Rigid mouthpiece makes it easy to hold in your lips - keeping your hands free
Micro design makes it easy to pack - but produces big, emotional sounds