Simplex 4903-9105 Category : Simplex I think that this strobe plate actually uses the same housing that the Simplex 4903-9101 uses. The strobe is obviously different. Brand SimplexModel 4903-9105Manufacturer UnknownType Alarm (Strobe Plate)
Wheelock MT4-24-LSM Category : WheelockI believe that this is an early version of the MT series since it doesn’t have covers over the screw...
System Sensor MASS2475ADA Category : System SensorMASS stands for “Multi-Alert Sounder/Strobe.” As the name suggests, it can do more than one tone. The only difference between...
