Bolid Rupor-300 Voice Alarm Unit (300 W)

Rupor-300 is the amplifier and message source of a voice alarm and evacuation system: it plays recorded phrases and dispatcher announcements zone by zone instead of just sounding a siren. 300 W covers a large building with dozens of loudspeakers. The unit supervises the speaker lines for open and short circuits, and the battery compartment keeps it running during a power cut — a direct code requirement for type 3–5 voice alarm systems in public buildings.