Wheelock MT-24-LSM Category : Wheelock I believe that this MT is newer than the Wheelock MT4-24LSM, yet older than the Wheelock MT-24MCW. Brand WheelockModel MT-24-LSMManufacturer WheelockType Alarm (Horn/Strobe)
Simplex 2098-9806 Category : SimplexThere is no difference between this unit and my other Simplex 2098-9806.
Space Age AV32 Category : Space Age ElectronicsI have no idea why there is no fire lettering on this unit
System Sensor P2R Category : System SensorThis is a 2-wire SpectrAlert Advanced, which is the alarm series that followed the SpectrAlert series.
