System Sensor 2W-B Smoke Detector and Base Two-Wire Power Zone

System Sensor B501 Smoke Detector base

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

System Sensor B210LP Smoke Detector Ceiling Mount Base, I-26

System Sensor B210LP Smoke Detector Mounting Base | Used | No Box | Wired

System Sensor 2551 Addressable Smoke Detector w/ Head And Base

System Sensor Addressable Smoke Detector with Thermal, Model 2551T.

System Sensor SS-Photo Photoelectric Smoke Detector with Base