The First Alert CO1210 is a residential carbon monoxide alarm engineered for a full decade of maintenance-free protection. Unlike standard CO detectors that require frequent battery changes, this model features a permanently sealed 10-year lithium power cell—no battery replacement is needed for the entire life of the unit. An end-of-life indicator alerts you when the alarm has reached its 10-year service limit and is ready for replacement.

The alarm includes a multi-function digital display that shows ambient room temperature during normal operation and switches to displaying current or peak CO concentration levels when carbon monoxide is detected. The large Test/Silence button makes routine testing simple, and the 85 dB alarm ensures an audible alert that can be heard throughout most homes. Installation is versatile, with both wall-mount and free-standing options included, requiring no special tools or wiring.