I’d heard about The Mosquito a few years ago as a European solution to the “teenagers loitering outside storefronts” problem. (In America we just make our teenagers stay at home.) A Consumerist thread pointed me to this YouTube video that you can use to figure out if you can hear the sort of high‐frequency sound generated by The Mosquito. I could near nothing until 17.7khz — at which point it clicked in, clear as a bell and annoying as Pauly Shore. It made me wish for the age‐based hearing loss that makes those over 25 supposedly unable to hear it. Will this keep kids away from your place of business? Yes, but it’d also keep me away, and I’m 26.