First Alert 0827B Smoke Alarm, 3 V, Ionization Sensor, 85 dB, White

The First Alert 0827B sealed ionization smoke alarm features a 10 years sealed lithium battery, eliminating the need for battery replacements during the lifetime of the alarm. This smoke detector with ionization sensor has a tamperproof design, a mute feature, a power LED, alarm indicator, end of life signal and single test button.