Been searching for the 20khz horn in my free time. My googlefu sucks so I usually have to have my better half find everything.I would start here, now they come with a remote control that gives you 160' range. My kiddo's electronics snap kit that has a sound meter that turns a light on, I bet you could rig something up similar for this!!!
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I think you could post videos you make with that safely here without catching the ban hammer. If you can find a horn set that goes over 20Khz you wouldnt even have to hear it but the dog sure would.
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