First Alert 1046836 Smoke Alarm, Ionization Sensor, White, 120V, Battery Backup

First Alert Smoke Alarm, Sound Level: 85dB at 10 ft, Sensor Type: Ionization, Power Source: 120 V with Battery Backup, White, Dimensions: 5.6 in L x 5.6 in W x 1.9 in H, Includes: 9V Alkaline Battery