BRK Electronics SC7010B Hard Wired T3 Smoke/T4 Carbon Monoxide Photoelectric Alarm with Strobe - Vaughn Engineering
X-Sense 2-in-1 Smoke and Carbon Monoxide Detector Alarm (Not Hardwired), 10-Year Battery-Operated Dual Sensor Fire & CO Alarm, Compliant with UL 217 & UL 2034 Standards, SC06 - Amazon.com
AC Hardwired Interconnect Smoke Alarm with Hush i12040 | Kidde
Hardwired Carbon Monoxide Alarms by USI
FIRST ALERT BRK SC9120FF Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 pack , White - Amazon.com
Gentex Hardwired Interconnected CO Alarm with Dualink CO1209 - The Home Depot