System Sensor, 12/24 V, Photo, Audible, Relay, Heat, 4-Wire, SS Model #4WTAR-B.
Smoke Detector Head & Base. Conventional, 12/24 Volts, Photoelectric, 4-Wire W/Heat Sensor, Relay, Audible. System Sensor Model #4WTAR-B. These are new Detectors purchased directly from System Sensor. These detectors have never been out of their boxes. Just Received 12-30-2022.