... sorts of combustible gases, such as coal gas, liquid petroleum gas and natural gas, carbon monoxide and monitor automatically.Specification:* ... consume: lower 2W* Alarm volume: ≥85dB within 1 meter* Operation Ambient Condition: 4~38°C, 25~85%R ... 3 minutes400PPM: ImmediatelyCoal gas: 1000~5000ppm,Liquid petroleum gas: 1000~5000ppm,Natural gas: 1000ppm~5000ppm*.Responding time: Gas ≤30S*.Alarm output: ...