These are sirens developed by the Mihajlo Pupin Institute in Belgrade, commissioned for use by the ministries of Defense and Energy. The system was developed in 1988, with the variant shown above being installed shortly after. Đerdap HPP, Limske HPP, Rudnik Gornji Milanovac Dam, and MEC Bitola are listed to have systems, but more are scattered throughout the region. The original models produce up to 115dBC at 100ft, while newer models produce up to 125dBC.
http://2010.telfor.rs/files/radovi/TELFOR2010_09_22.pdf

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