Kidde 900-0136-003 Sealed Battery Operated Smoke Alarm With Smart Hush, 85 DB At 10 FT Loud, (3) 3 V Operating, 40 - 100 DEG F Operating, Environmental Conditions: 5 - 95 PCT Relative Humidity (RH), Ionization Sensor, Dimensions: 5.6 IN Diameter X 1.55 IN Depth, Flashing LED Display, Mounting: Wall