Involvement:General (knows how to use it) - Ownership:1 week to 1 month
Well made dog whistle, great build quality. Seems identical to very a famous brand (Google "silent dog whistle") that sells for up to $100 (!)
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.
(1) the claimed "3~4 kilometers" range is absurd; (2) it may perhaps be generating harmonics of the 9KHz fundamental; (3) my 12 1/2 year old Border Collie sits up and takes notice when it is blown; (4) the reaction of other dogs ranges from complete indifference to startled fear. To increase the frequency, pull off the black cover - it's a tight fit - and tighten the knob (see my uploaded images).
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.
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