This method is proven in the field and consequently used regularly by the leading guides. These bear hunting calls produce variable pitches and the noises - many concentrate on the sound of a distressed cub. They can be of single or dual reed design, constructed with a molded body and very often with aluminum through the center. Injected nylon adds strength making them almost unbreakable. They can be hung around the neck off a lanyard or clipped to a shirt as you would a pen.
There are also bear calls that are a little more sophisticated in their creation in that they come in the form of a wireless digital system. These are multi-functioning with sound control and different ranges of frequency. They can be operated remotely on battery power for a full day at a time.