{Safty Assurance} -- This Gas detector is mainly used to detect natural gas (main component: methane), liquefied petroleum gas (main component: propane, butane) and city gas (alkane, olefin, arene). When the flammable gas leakage exceeds the standard, the gas detector will issue slow or accelerated or rapid, continuous 85DB sound alarm. It can't detect CO and CO₂ {Digital display & Sound alarm} -- Number 0 showes on the gas detector indicator under normal conditions. If a flammable gas leak is detected, the indicator will showes numbers 1-9 and A. Once the concentration exceeds 3% LEL, the alarm sounds and flashes red. According to different concentration of combustible gas leak, the alarm will shows different states {Energy saving & Durable} -- Standard British plug, not required converter, installation is extremely simple. Plastic ABS material, easy to clean. Using <2 watts of power, significant energy saving. Widely used in restaurants, kitchens, hospitals, hotels, oil plants, garages, gas stations, etc {Test Method} -- Press and hold the lighter switch at the inlet of the methane detector and slowly deflate (do not turn the lighter on while deflating). When the concentration reaches the standard, an alarm will alarm until the volume of ambient gas falls below the alarm point. Precautions: It takes about 2-3 minutes to warm up the system, the gas test will not work during this time {Remind for Installation} -- This gas alarm uses high quality sensors, semiconductor heating and SMT chip technology; Do not install it in a place with a lot of dust, oil smoke and water vapor, which may cause false alarms; Choose a suitable location to install the alarm according to the actual situation