Honeywell Home Wi-Fi 7-Day Programmable Thermostat + First Alert Onelink Smoke Detector and Carbon Monoxide Detector Hardwired - Amazon.com
SITERWELL Smoke Detector, 10 Year Smoke Alarm with Photoelectric Sensor and Built-in Battery, Fire Detector with Low Battery and Fault Warning for House and Bedroom, UL Listed, GS526A, 2 Packs - Amazon.com
Kidde Hardwired Interconnectable Smoke and Carbon Monoxide Detector with AA Battery Backup and Voice Alerts 21032082 - The Home Depot
Honeywell Home CO Detector With Transmitter - 5800CO | Abt
PROSiXCO - Resideo Honeywell Home Wireless Carbon Monoxide Detector (for ProSeries Control Panels)