System Sensor 4W-B i3 Fire Alarm Photoelectric Smoke Detector w/ Base USED

System Sensor 4WTA-B Fire Alarm Photoelectric Smoke & Heat Detector Head USED

System Sensor 4WT-B 4-Wire Smoke Detector - Same Day Shipping

System Sensor 4WT-B Photoelectric Smoke Detector 4-Wire

NEW System Sensor Smoke Detector 100 Series 4-Wire Photoelectric 2112/24TS

System Sensor 4WT-B 4-Wire Smoke Detector unopen - sealed box

System Sensor 2W-B 2-Wire Smoke Detector

System Sensor 2WTA-B Fire Alarm Photoelectric Smoke & Heat Detector w/ Base USED