... Siren,Ambulance Siren) is used abroad in police Dept. Fire Dept. Ambulance and so on area ! Electronic Siren(Emergency ... Siren,Ambulance Siren) is used abroad in police Dept. Fire Dept. Ambulance and so on area !Adopting high-tech ... faceplate, supper and fix two tracks, it has public security, fire-control, rescue tunneling engineering. Air raid shelter, siren andmegaphone functions ...