Not the first time. This one I am surprised I could hear since it appears quite high, but also it’s mostly an awful feeling of pressure rather than just eeeeeeeeeeeeeeeeeee
Found inside a certain shopping center.
Not the first time. This one I am surprised I could hear since it appears quite high, but also it’s mostly an awful feeling of pressure rather than just eeeeeeeeeeeeeeeeeee
Found inside a certain shopping center.
Spectroid, nice.
Sadly there is no database that i know of. But at this high frequency it should be rather direktional. Walk around a bit and u should be able to find the source.
I would guess its one of those:
LED light power supply
Resonanc in the pipes from water flow
Sonic tracking of customers