Siren security and fire speech (loudspeaker) "GLAGOL-ZP-20" (hereinafter referred to as the siren) is designed to reproduce voice messages, special signals in fire alarm systems, as well as speech information and background music in loudspeaker systems, sound reinforcement and broadcasting. The siren is designed as a "two-way" - i.e.
the spread of sound vibrations is produced by two identical speakers in opposite directions.
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