Kidde 0919-9999 Battery Operated Wireless Interconnectable Smoke Alarm, 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: 5-3/4 In Diameter X 1-1/4 In Depth, Led Display, Mounting: Wall or Ceiling, Sensitivity: 0.69 Plus/Minus 0.19 PCT/FT, Power Source: 3 AA Alkaline Battery, Ul 217, Nfpa 72, (Chapter 11 2002 Edition) The State Of California Fire Marshall, Nfpa 101 (One and Two Family Dwellings) Fede