19kHz at BigBox Takadanobaba (North exit) #UltrasoundInAir
35°42'46.2"N 139°42'16.0"E
1-chōme-35-3 Takadanobaba, Shinjuku City, Tōkyō-to 169-8677
https://goo.gl/maps/dh2GoZ9wTY4NT4wbA …pic.twitter.com/D8bRLWMg5C
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This isn't signalling, it's supposed to be a rat deterrent. They blast it at >130dB SPL. It's messed up.
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That’s insane. I can hear up to 20 kHz (unfortunately - measured by a doctor in a lab), so this would drive me nuts and possibly cause tinnitus due to hearing loss (I already have one due to such shit). This is outright assault. Lucikly didn’t encounter on my last Tokyo trip.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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