Components of the alert system in the hands of Sergey 'Flash' Beskrestnov

Sergey 'Flash' Beskrestnov holds a portable alert device and power unit, demonstrating components of the siren system

In the photo, Sergey 'Flash' Beskrestnov, a well-known expert on alert systems, holds a portable device for transmitting alarm signals and a power unit. The image illustrates the technical aspect of how sirens work after an impact.

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