System Sensor 2W-B i3 Series 2-Wire, Photoelectric i3 Smoke Detector

System Sensor 4WT-B 4-Wire, Photoelectric i3 Smoke Detector With A 135 Degree Fixed Thermal Sensor

System Sensor 2WT-B Photoelectric Smoke Detector With 135 Degree Thermal

SYSTEM SENSOR 4WTA-B 4WTAB 12/24 VDC, Photoelectric Smoke Detector With Thermal, Sounder, And Base

SYSTEM SENSOR D4120 Smoke Detector, 24VDC / 120VAC, Photoelectric Duct Sensing, Interconnect Up To 50

System Sensor D4120W Watertight 4-Wire Photoelectric Duct Smoke Detector 24VDC/120VAC

SYSTEM SENSOR 2W-B Photoelectric Smoke Detector, 2-Wire, Efficient Fire Detection, Compatible With i3 Protocol Systems

System Sensor 2WTA-B Smoke Alarm With Sounder, Relay And Isolator Options Form C Relay Isolated Thermal Sensor Plug-In Design, Base Included