BRK 10-Year 6-Pack Photoelectric Smoke Alarm

6-Pack 10-Year Photoelectric Smoke Alarm Battery, Contractor Pack. The SM210 10-Year Sealed Battery Smoke Alarm with Slim Profile Design is equipped with First Alert's Precision Detection advance sensing technology and meets new industry standards. This slim profile smoke alarm is easy to install, and the 10-year sealed battery means no battery replacements are required.