Kidde 0916E Battery Operated Smoke Alarm With Hush, 85 DB At 10 FT Loud, 9 VDC Operating, 40 - 100 DEG F Operating, Environmental Conditions: Up To 85 PCT Relative Humidity (RH), Ionization Sensor, Dimensions: 5 IN Diameter X 1-1/2 IN Depth, Flashing LED Display, Mounting: Wall Or Ceiling, Sensitivi