From the age of 14 German Klaus Weisskirchen has used age calls and even produced the sounds of the animals with his mouth to optimize the chances of success in hunting.

He learned the process of making game calls from the companies Buttolo and Hubertus, who have more than 150 years of experience in the development of predator game calls.

Klaus Weisskirchen was at that time a recognized game keeper, and he worked with professional hunters, biologists, wildlife experts and book writers, where he received massive information about predators sounds and behaviors. In collaboration with his network, Klaus  today has a large program of game calls for the Nordic wildlife, including fox, roe deer, red deer, wild boar, crow, mallards and greylag goose.