First Alert has been making smoke alarms for decades. The SMICO100 is their latest battery-operated combo unit, and it brings together smoke and carbon monoxide detection in a single device. The key upgrade here is Precision Detection, which is designed to reduce nuisance alarms from cooking or steam while still catching real threats quickly.

Installation takes about two minutes. The alarm mounts directly to the ceiling or wall with the included hardware. It runs on a sealed lithium battery that lasts the full 10-year life of the unit. That means no chirping in the middle of the night to change batteries. The alarm uses an electrochemical sensor for CO and a photoelectric sensor for smoke, which is better at detecting smoldering fires than older ionization models.

The test button lets you check both sensors at once. The voice alert announces whether it’s smoke or carbon monoxide, so you know what you’re dealing with immediately. There’s no smart home integration or app control here. That keeps the price low and the setup simple. If you just need reliable detection without a monthly subscription or Wi-Fi configuration, this is a solid choice for any bedroom or hallway.