Specifications: 1) Working voltage: DC 9V (battery supply) 2) Working current: monitor state: less than 12μA, alarm state: less than 10mA 3) Alarm loudness: distance 3m, loudness not less than 85dB 4) Temperature: -10°C ~ +60°C 5) Relative humidity: ≤95% (40±2°C) 6) Physical dimension: Φ100 x 35mm 7) Weight: 130g Packing: color box