Siemens U-MHST-MCS Category : Siemens I believe that this alarm has the ability to produce multiple tones. Brand SiemensModel U-MHST-MCSManufacturer SiemensType Alarm (Horn/Strobe)
Federal Signal AV34+450D Category : Federal SignalThe AV34 light plate was made by Space Age Electronics and the 450D horn was made by Federal Signal.
Simplex 4904-9103 Category : SimplexThis is the ceiling-mount version of the Simplex 4904-9101 remote strobe.
