Kidde Smart Smoke and Carbon Monoxide Detector with Indoor Air Quality Monitor, Hardwired, 10-Year Lithium Backup Battery 21030843 - The Home Depot
LCD CO Sensor Smoke Detector Work alone Carbon Monoxide Poisoning Warning Fire Alarm Built-in 85dB Siren Sound Independent
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