The First Alert® SM210V Smoke Alarm has a sleek, low‑profile design and features a 10‑year battery that eliminates replacements and low‑battery chirps for the life of the alarm. With a friendly voice that announces the location of danger and Precision Detection™ technology to provide early warning, it’s designed to help your family react quickly and safely. Friendly voice tells you the location of danger to help you escape safely Sleek, low profile design blends seamlessly into walls or ceilings 10-year sealed battery eliminates the cost and hassle of changing the alarm's batteries, plus low battery chirps for the life of the alarm Precision Detection™ technology reduces cooking nuisance alarms while providing early warning in the event of a fire emergency End-of-life warning lets you know when it's time to replace the alarm.