Electronic Siren(Emergency 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 programming integrated circuit, partial structure design which resects in convenient installation. Color luminous indicating faceplate, supper ...