Whistle double tone 640
Flute with double tone (two sides). With standard frequency for the best result. The flute is provided with a continuous flute and a vibrating flute. Flute with a consistently clear sound, excellent audible. This double dog whistle is widely used in training and hunting. A whistle that has effect even over long distances and in disturbing environmental factors (wind, rustling leaves). The 2 signals are heard loud and clear.