I purchased three of these whistles cause i wanted something that sounded different than all the other guys with the same whistle. This whistle is loud and effective. i train with a number of other people in a group and some guys discipline their dogs with a whistle to down stay and so forth. and with everyone using the fox 40 or the standard gonia or sport dog whistle the dogs get confused but my dog ignores their whistles and turns on a dime with the acme tornado if i need to use it to get his attention or recall. The best part is it is as effective on a nice quiet day as it is with 30mph winds and my dog is out chasing a porcupine and I am able to call him off of it.
A whistle that doesnt whistle.
I added this one to another order becasue I wanted to start using a whisle for recall. The problem is it did not make any whistling sound. It just sounded like blowing air. I ended up buying the sportdog whisle instead.