Pet Dog Whistle Training Obedience Ultra Sonic Sound - Silver + Black

Pros: Well made dog whistle, great build quality. Seems identical to very a famous brand (Google "silent dog whistle") that sells for up to $100 (!)

Cons: It's not silent, nor is it ultrasonic. The maximum frequency is about 9KHz, which all but the deafest and oldest humans or dogs will easily hear; but apparently this is normal for such whistles.

Other: It's certainly interesting, but may not be as useful as you would wish. Still, the price is so low that it's worth trying, and I'm happy with my purchase.

Pros: Easy way to get my dog actually listen to me. Works also outside. Useful, small and easy to use.

Cons: Not ultrasonic, you can hear it. You have to blow it really hard so the dog would listen. But in the end you will be annoyed by that weird sound it makes.

Other: Useful thingy. Small and I can take it everywhere. Really helpful outdoors because my dog doesnt understand her name yet, but now when I whistle, she comes at least a bit closer.