Help keep your home and family safe with this First Alert SA303CN3 Battery Powered Smoke Alarm. It features an ionization sensor for smoke detection and a loud 85-decibel alarm. It also includes a convenient single test/silence button for fast muting in the event of nuisance alarms from cooking smoke or shower steam. The battery-powered alarm doesn't require wiring to install and continues to monitor your home even if there's a power failure. The tamper-resistant alarm has an easy-access side battery drawer, so there's no need to remove the alarm from the ceiling to change the battery. Less than 12 inches (305mm) away from fluorescent lights. Electrical“noise” can interfere with the sensor