🐶 ROFAKU Ultrasonic Dog Whistles, New 2021 2PCS Silent Ultrasound Training Whistles for Barking Control | Adjustable Pitch & Lanyard | Pet Dog Training Essentials (Black) Review

It looks like the whistle can be adjusted but no instructions for use were included. It's not silent. The whistle does not affect dogs barking.

God I wish I had paid more attention to the reviews. Really, when the best reviews aren't even about the product. The whistle doesn't work, don't waste your money.

I found out and it works on my dog. There was nothing that even told me there was a way to change the pitch. Or how to access the valve.