PRAKSHI 2Pack Dog Whistle, Dog Whistle to Stop Barking Neighbors Dog, Adjustable Ultrasonic Silent Dog Whistle, Professional Recall Dog Training Whistles, with Lanyard

This whistle isn't "ultrasonic", it's just high-pitched, but even when adjusted to the highest pitch setting it is still very audible to human ears. Didn't work at all and is 100% not as described. Don't bother. Returning immediately. Amazon continues its decline into "eBay-dom" every day, flooded with garbage.

Said that it was a "silent " whistle. It's not even close to being silent. The only thing that it irritates, is me!

Whistle received with a cracked black sheath. No instructions on how to adjust sound.

Waste of money. Doesn't work.