The First Alert SMCO210 is a sealed 10-year battery combination smoke and carbon monoxide alarm featuring Precision Detection advanced sensing technology. This 2-in-1 alarm provides reliable protection against both fire and carbon monoxide threats in an easy-to-install detector. The alarm uses electrochemical and photoelectric sensors that comply with UL 217 10th Edition standards to reduce cooking nuisance alarms while providing early warning in home fire emergencies.

The slim profile design is half the depth of a standard alarm, measuring just 1 inch tall by 5.67 inches in diameter and weighing 0.73 pounds. The 10-year sealed lithium metal battery eliminates the need for battery replacements and low battery chirps for the entire life of the alarm. Additional features include an end-of-life warning to alert when replacement is needed, a test/silence button for efficient testing, and an 85dB alarm sound level at 10 feet. The alarm carries a 10-year limited warranty and meets both UL 217 10th Edition and UL2034 standards.