Kidde is a name you see in building codes for a reason. Their carbon monoxide detectors use an electrochemical sensor, the same reliable technology found in professional-grade industrial monitors. This six-pack covers the key points in a home—near bedrooms and fuel-burning appliances—with a set-it-and-forget-it approach.

Each unit is powered by a sealed 10-year lithium battery. You install it once, on a wall or a shelf, and it’s done. The battery means it guards your home even during a power outage. When CO levels rise, an 85-decibel alarm cuts through walls and closed doors. A trio of LED lights and an alarm memory function tell you at a glance if it’s a current warning or a past event you missed.

The design is simple, white, and unobtrusive. You get six identical detectors with a full decade of protection, which makes outfitting an entire house straightforward and cost-effective. Just remember to test the alarm button monthly; that decade of coverage only works if the electronics are functioning.