First Alert has been making residential safety devices for decades, and the SMICO110 reflects a straightforward approach to home protection. This is a 2-in-1 smoke and carbon monoxide alarm that runs on a sealed 10-year battery. You install it once and don’t think about it again until the unit chirps its end-of-life warning a decade later.

The combination sensor catches both fast-burning fires and smoldering ones, plus detects CO from gas appliances or a running car in an attached garage. It’s battery-powered, so no hardwiring is needed. Mount it on a wall or ceiling with the included hardware, and you’re done. The test/silence button works as expected, letting you hush false alarms from cooking without ripping the unit down. At 85 decibels, the alarm is loud enough to wake most sleepers through a closed door.

One honest note: this is a basic unit without smart features. There is no Wi-Fi, no phone alerts, and no voice warnings. If you want remote notifications or integration with a smart hub, look at First Alert’s Onelink line. But for a simple, set-it-and-forget-it safety device that meets current UL standards, the SMICO110 gets the job done with zero maintenance.