System Sensor P4R Unlike my System Sensor P2R, this alarm does 4-wire operation. Brand System SensorModel P4RManufacturer System SensorType Alarm (Horn/Strobe)
Simplex 4251-20 Category : SimplexI believe this is an older, less seen model of 4251-20. It has a slightly different handle from my other...
Simplex 2098-9806 Category : SimplexThere is no difference between this unit and my other Simplex 2098-9806.
Gaylord NC-1357A Category : GaylordThis is a rebranded EST/Edwards 270-SPO for use in some sort of ventilator system.