BRK 100S First Alert Smoke Alarm With Integrated Strobe Light, Loudness: 85 DB AT 10 FT, Operating Frequency: 60 HZ, Operating Voltage: 120 VAC, Operating Current: 0.05 AMP Standby, Operating Temperature: 40 - 100 DEG F, Environmental Conditions: Humidity: 10 - 95 PCT Relative Humidity (RH), Sensor: