Links and pic's please? I haven't heard of these whistles until you posted your question. I am always looking for new gear and whistles are one of those things, like flashlights, which I can afford to try out.
The large round part goes in your mouth and you need to position your tounge correctly. It takes a little practice but they are pretty loud. They are supposed to be used to control herding dogs at a distance. I am by no means an expert so if anybody can give a better description please chime in.
WARNING & DISCLAIMER:
SELECT AND USE OUTDOORS AND SURVIVAL EQUIPMENT, SUPPLIES AND TECHNIQUES AT YOUR OWN RISK. Information posted
on this forum is not reviewed for accuracy and may not be reliable, use at your own risk. Please
review the full WARNING & DISCLAIMER about information on this
site.