Used Silent Knight SD505-APS Addressable Smoke Detector WITH base

(1) Silent Knight SD505-APS Smoke Detector Head TESTED WORKING

SILENT KNIGHT SD505-APS PHOTOELECTRIC SMOKE DETECTOR

Silent Knight SD505-APS Photoelectric Addressable Smoke Detector.

SILENT KNIGHT SD505-APS PHOTOELECTRIC SMOKE DETECTOR

Honeywell Silent Knight SD505-APS Smoke Detector

Silent Knight SD505-APS Fire Alarm Smoke Detector Head

Silent Knight SD505-APS Smoke Detector TESTED (without base)