Nordik Predator is Denmark's and the Nordic region's most popular decoy call. Here you get 2 lure calls in one package. With Barrborn Pro you can produce sounds that irritate the crows and attract them. With Barrborn Basic you can produce quieter sounds that the crows use to signal that the area is safe. The calls are specially adapted to the Nordic crows. There are many good instructional videos on YouTube - search for Nordik Predator.