It is the ultimate open reed predatorcall. It is developed and produced by Kristoffer Clausen. Effective predatorcall for redfox, coyotes, jackals, crows and other predators. Clausen Predatorcall 1 is the ultimate open reed predatorcall. It is developed and produced by This call is very easy to use and has a large variety of sounds. It also comes with an extension for higher volume and a different tone and pitch to the sound.