Sirene, de interior sau de exterior– Sunt dispozitive acustice si in unele cazuri optice. Dispozitivele optice de alarmare se utilizează, în general, ca suplimentare a celor acustice. Ca dispozitive acustice pot fi utilizate sonerii, hupe, difuzoare etc.
Echipamente de avertizare se folosesc pentru alarmarea ocupantilor locului supravegheat.
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