Plug-in carbon monoxide detector with 9V battery backup ensures ongoing protection during outages, sounding a powerful 85 dB alarm upon detecting hazardous CO levels. It employs electrochemical sensor technology for dependable and precise detection, plus a convenient test/silence button. The slim unit fits any standard 120V outlet, allowing versatile positioning around the house.
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Plug-in carbon monoxide detector with 9V battery backup ensures ongoing protection during outages, sounding a powerful 85 dB alarm upon detecting hazardous CO levels. It employs electrochemical sensor technology for dependable and precise detection, plus a convenient test/silence button. The slim unit fits any standard 120V outlet, allowing versatile positioning around the house.

First Alert Hardwired Smart Smoke Alarm

The First Alert® SMCO210 Sealed 10-Year-Battery Combo Smoke and CO Alarm with Slim Profile Design uses our Precision Detection advanced sensing technology to meet the latest industry standards. This 2-in-1 alarm provides convenient protection against both fire and carbon monoxide (CO). The slim-profile combination alarm is half the depth of a standard alarm. It is sleek and compact to help the detector blend seamlessly with most home décor. And the 10-year lithium battery means no battery replacements for a decade – the end-of-life warning lets you know when it is time to replace the alarm. No more low-battery chirps and multiple battery replacements!

Install reliable fire and carbon monoxide (CO) protection with this First Alert® Value Safety 2 Pack. It includes the SMI100 battery-operated smoke alarm and the CO400 battery-operated carbon monoxide alarm. The SMI100 Smoke Alarm features the First Alert® Precision Detection advanced-sensing technology that meets the latest industry standards to reduce cooking nuisance alarms, detect smoke from synthetic materials, and provide early warning in the event of a home fire emergency. The CO400 carbon monoxide alarm utilizes an electrochemical carbon monoxide sensor - the most accurate sensor available - to detect carbon monoxide. Both are battery operated, easy to install, have convenient test/silence buttons, front-access battery doors for easy battery replacement, and will work in the event of a power outage.