System Sensor 2WT-B I3 Series Smoke Detector 2-Wire Plug-In Photo 12/24V

System Sensor 4W-B Photoelectronic Smoke Detector 12/24V UL Listed

System Sensor Photoelectric I3 Smoke Detector (4WT-B)

System Sensor 4WTA-B 4W Smoke Detectors

System Sensor 4W-B 4-Wire Photoelectric Smoke Detector with Mounting Base

System Sesor 4W-B Smoke Detector (Tested)

System Sensor SpectrAlert 4WT-B 4 Wire Smoke Detector With Built-In Heat Sensor

System Sensor 2W-B Smoke Detector USED