this call is large and incharge one of my favorite all time calls
 
Dr. Death was designed for producing loud, raspy, and crisp rabbit in distress sounds.
It features an internal tone board with a thin mylar reed. It has been hailed as a “go to” call for many seasoned coyote and predator hunters.
Dr Death has an extra large exhaust port that allows for better vocal manipulation with your hands. If you are looking for a professional grade hand call that works on calling coyotes, Dr. Death is your hand call!
 
youtube video link of this call 
https://youtu.be/qQiXVi7rkY4