PROSiXCOMBO - Resideo Honeywell Home Wireless Combo Smoke/Carbon Monoxide Detector (for ProSeries Control Panels)
First Alert Battery Powered SCO500B Wireless Interconnected Photoelectric Smoke and Carbon Monoxide Combo Alarm with Voice and Location - Combination Smoke Carbon Monoxide Detectors - Amazon.com
AEGISLINK Interlinked Smoke Carbon Monoxide Detector Combo, Smoke and CO Detector Battery Powered, Wireless Interconnected Smoke and CO Alarm, Digital Display, SC-RF200, 6-Pack - Amazon.com
System Sensor COSMO-2W 2-wire Smoke CO Detector Combo