First Alert SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm
Smoke and CO Alarm Detector Combo Unit Battery Operated - Amazon.com
X-Sense Wireless Interconnected Combination Smoke and Carbon Monoxide Detector with LCD Display & 10-Year Battery, Over 820 ft Transmission Range, 3-Pack - Amazon.com
First Alert 10-Year Battery-Operated Combination Smoke and Carbon Monoxide Detector in the Combination Smoke & Carbon Monoxide Detectors department at Lowes.com
Kidde Code One Smoke & Carbon Monoxide Detector, Hardwired with AA Battery Backup & Voice Alarm 21027519 - The Home Depot