Smoke detector, 12/24 Volt, Photo, Thermal, 4-Wire, System Sensor #4WT-B
Smoke Detector Head & Base. Conventional, Photoelectric, 4-Wire W/Heat Sensor. System Sensor Model #4WT-B. These are new Detectors purchased directly from System Sensor. These detectors have never been out of their boxes. Just Received 06-01-2022.