4 in 1 carbon monoxide and gas detector lpg/natural gas alarm with CO sensor

​The product(SR-908DSZ)is a smartcarbon monoxide and combustible gas combo detectorwith voice prompt, insert the voicechip, microprocessor control, supports displaying of the gas concentration. This product is used to detect both thetoxiccarbon monoxide gas and combustible gas (such as liquefied petroleum gas, natural gas, CH4(methane),etc). Whentrigger the detector, it will alarm with build-in siren. This detector adopts catalytic combustion method sensor andelectrochemical sensor which is stable and reliable more detail：https://www.firealarmfactory.com/carbon-monoxide-and-gas-detector.html