System Sensor S241575 This alarm is a red SpectrAlert Classic remote strobe. Brand System SensorModel S241575Manufacturer System SensorType Alarm (Strobe)
GE 521BXT Category : GEI think that this smoke detector might be intended for use in security systems.
Gamewell GW-30203-01 Category : GamewellThis is a somewhat obscure Gamewell alarm condition light, most likely used with system components such as duct detectors.
Simplex 4098-9716 Category : SimplexI don’t think that I have a base that is compatible with this head.