Siemens U-MHU-MCS I believe that this alarm is capable of doing multiple tones. Brand SiemensModel U-MHU-MCSManufacturer SiemensType Alarm (Horn/Strobe)
System Sensor MA-12/24L Category : System SensorIf I remember correctly, this sounder can be used for purposes other than fire protection.
Grinnell IXA-RMS Category : GrinnellThis unit was taken off of a TFX-400 system at Brigham Young University.
Amseco BZ-54VT+RSD-24L Category : AmsecoThat rubber band is holding the strobe to the unit since there are no screws keeping it secure.