Siemens U-MHU-MCS Category : Siemens I believe that this alarm is capable of doing multiple tones. Brand SiemensModel U-MHU-MCSManufacturer SiemensType Alarm (Horn/Strobe)
EST SIGA-278 Category : EST/EdwardsThis unit is rusting ever so slightly. It features a newer EST logo on it.
Pyrotronics ES0-24S Category : Cerberus Pyrotronics, PyrotronicsThis is a rebranded Wheelock horn/strobe, and a pretty rare one at that since it has an electronic horn mechanism...
