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The System Sensor B300-6 is a white
Simplex 6334-9144 6 Digit Red Blue Screen
System Sensor 5603 135F Fixed Temp
This item has been discontinued
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Siemens OP921 (S54320-F4-A2) Smoke Detector Sale The System Sensor B300-6 isSiemens OP921 (S54320 F4 A2) Photoelectric Smoke Detector Model OP921 incorporates an optical sensor using a light scattering detection principle. The device utilizes advanced software algorithms to analyze the signals providing highly stable and accurate smoke detection. Model OP921 is UL 268 7th edition listed incorporating advanced built in ISOtechnologyTM True Class X SLC operation (use is optional), greatly improving system reliability and
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