Wheelock HSR Category : Wheelock This is from the Exceeder series. The only difference between this and my Wheelock HSW is the color. Brand WheelockModel HSRManufacturer WheelockType Alarm (Horn/Strobe)
System Sensor 5601P Category : System SensorThis is a 135F rate of rise and fixed temp heat detector.
National Time D900-PHOTO Category : National TimeThis same type of detector, which is manufactured by Apollo, is used by several other companies, such as Gamewell-FCI.
