... alarm siren 300W: Hooter,Overtake alarm,Mike Loud-speaker, way alarm(Yelp);,Traffic alarm(Horn), Fire fighting alarm and rescure CJB siren(Annunciator,alarm,police product.)Specification:alarm siren ... 300W: It adopts detached design,has 10 kinds of tones. ... Temperature: -30 to +65 centigrade Electronic Siren(BS-137)