The BS-4 message unit provides:
- storage of up to 16 previously recorded speech alerts on 4 SD memory cards (4 files on each memory card);
- playback of one speech signal, several or all four simultaneously on four outputs of the device;
- automatic start of playback when a command pulse is received at the device input;
- reception of an external message (signals from the GO input) and its broadcasting through all four notification lines simultaneously;
- manual start for control listening to the recorded speech messages;
- control of external light boards;
- control of external executive devices for evacuation (switching "dry contact", normally closed "NC" and normally open "NC" relay contacts).
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