System Sensor B401 400 Series 2 Wire Smoke Detector Base

System Sensor B401 400 Series 2-Wire Smoke Detector Base

System Sensor B401B Plug-In Fire Alarm Smoke Detector Base, E-21

Simplex 4098-9792 TrueAlarm SSD Standard Sensor Base For Smoke Detector

System Sensor 2400 Series Smoke Detector w/ Base

System Sensor 2W-B i3 Fire Alarm Photoelectric Smoke Detector w/ Base USED