This alarm is a household combustible gas detector, suitable for detecting and alarming natural gas and carbon monoxide, when the gas detecting part of this detector detects natural gas or carbon monoxide reaches the alarm concentration or above, the detector will send out an alarm. Please note: The gas monitored by this detector specifically refers to natural gas, the main component of which is methane, this product is not applicable to the detection of other alkane gases such as liquefied petroleum gas lighter gas and smoke.