Easily add reliable detection against fire and carbon monoxide (CO) with the First Alert 10-Year Sealed Battery Smoke Alarm and the Plug-In Carbon Monoxide Alarm Safety Value Pack. This safety bundle includes the SM210 Smoke Alarm with a modern, low-profile design and 10-year sealed battery. It also comes with the CO3-P01 Carbon Monoxide Alarm, which plugs into any standard outlet and features a battery backup to help ensure CO detection even during power outages.