Aparatul emite prin intermediul difuzorului doua sunete distincte, foarte puternice, asemanatoare sirenei salvarii. Sunetele sint generate de doua mul ti vibrat oare simetrice. Impulsurile generate de multivibrator sint diferentiate si amplificate de tranzistorul T5. Frecventa de repetare a impulsurilor se alege, variind valoarea celor doi potentiometri de 50 K.Sirena poate fi utilizata drept semnalizator de alarma antifurt, la locuinte, garaj, automobil etc. impreuna cu un releu de timp poate fi utilizata pentru anuntarea pauzelor de lucru etc.
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