... ,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 ... (dual 150w speakers)Operating Temperature: -30 to +65 centigrade Electronic Siren(BS-137)