Simplex 2098-9209 This is a photoelectric smoke detector. Brand SimplexModel 2098-9209Manufacturer HochikiType Smoke Detector
Simplex 2901-9333 Category : SimplexThis bell is compatible with some of Simplex’s strobe plates, such as the Simplex 4904-9139.
Simplex 2098-9788 Category : SimplexFigures I’d have a few duplicates of this fairly simple light plate.
System Sensor SP1W2475ADA Category : System SensorThe strobe portion can detach from the speaker body.