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> This is what I don't get - how the hell did they manage to get investors? Because they did a couple of things absolutely right which was to pick something th

> This is what I don't get - how the hell did they manage to get investors? Because they did a couple of things absolutely right which was to pick something that'd have huge, giant, insane rewards if it works and picked something that's not so crazy implausible that it would require totally new physics to work. Sadly even if it does work I wouldn't want it because even though you can't hear ultrasound I'm sure it wears on your ears just the same. The wavelength of 40kHz is 0.339 inches and 60kHz is 0.226 inches which are definitely on the right order of magnitude to resonate inside your ear which seems...sub optimal. I seem to remember that their tech operates in this band.

TeMPOraL 11y ago
Another thing that nobody seems to be bringing up: animals. I don't know what's the full range of hearing of rats, but they talk a lot over ultrasound, with little-over-22kHz band being used to signal danger, and something around 56kHz to signal friendliness/food locations[0]. If their idea worked, they would likely piss off a lot of rats. Not many people keep rats as pets, but some other animals and usual city wildlife probably hear those ranges too. [0] - source: my ex-gf had rats as pets and I did some googling a few years ago to figure out what kind of experiments I could do on them ^_^.