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That's the Mosquito Anti Loitering Device http://www.movingsoundtech.com/ http://www.movingsoundtech.com/ It a high frequency that only young ears can hear th
by ourmandave 9y ago
That's the Mosquito Anti Loitering Device
http://www.movingsoundtech.com/ http://www.movingsoundtech.com/
It a high frequency that only young ears can hear that sounds like the whine of a mosquito. Old ears lose frequency range so aren't bothered. It's not harmful, just annoying.
- jsjohnst 9y agoThese devices still bother my ears even at 37.
- StavrosK 9y agoSame here, we encountered one in Tokyo and I had to run away. My (younger) friends all thought I was crazy until I sent them the link to the device months later.
- zapperdapper 9y agoThat was my son's reaction - he couldn't get out of there fast enough!
- PeterisP 9y agoAt a sufficient volume, the sound would be damaging the ears even if it's above the frequency that you can hear.
- ourmandave 9y agoHopefully they'd make it so even cranked to 11 it couldn't hurt anyone.
- kfriede 9y agoFor a manufacturer it's not as cut-and-dry. The damage caused is a factor of the level (dB) received combined with the length of exposure. Assumptions will have to be made as to how far away the user will be from the device and how long they can reasonably be expected to be exposed. For example, if you assume that someone will be under it for 8 hours (an employee during a work day), the OSHA approved exposure is 90dB, which will likely not be annoying enough to serve its purpose.
- tomsthumb 9y ago90db is pretty loud and will totally wreck your hearing, which makes the situation kind of messed up because workers might not even know they're being exposed to this sound.
- thatcat 9y agoThat doesn't seem physically possible since it's based on sound pressure waves.. From your link, mk1 uses 85 db set volume; mk2 uses ambient noise level + 5db.
- secfirstmd 9y agoIt's disgraceful to use such a device that deliberately targets the young. I can hear it and it's a annoying as shit and I'm 32. AFAIK they have now been thankfully been banned in the UK/Ireland. In London, TFL has found the same effect can be hard without some discrimination by playing classical music.
- ourmandave 9y agoThat will drive off the young street punks. But instead you'll have a bunch of old codgers setting up their checker tables, hanging out for hours complaining about their problems, and pining for the good old days. That's my retirement plans anyway.