SYSTEM SENSOR CO1224T 12/24 volt, 4-wire, system-monitored C02 carbon monoxide detector w/ RealTest Technology: Amazon.com: Tools & Home Improvement
COSMO4W - Honeywell System Sensor i4 Hardwired 4-Wire Smoke and Carbon Monoxide Detector
System Sensor Carbon Monoxide Detector CO1224TR with RealTest 12/24 VDC: Smoke Detectors: Amazon.com: Tools & Home Improvement
System Sensor COSMO-2W Best-in-class 2-Wire carbon monoxide (CO) and smoke detection technology in a single, system-connected device. Requires interface module COSMOD2W. 12/ 24 V
System Sensor CO1224T - Walmart.com
CO1224TR - System Sensor
SYSTEM SENSOR Carbon Monoxide Detector Model. CO1224TR