About this item Keep Safety-- The gas detector is mainly used to detect natural gas (main components: methane), LPG (main components: propane, butane ) and urban coal gas (alkane, olefin, arenes). When the combustible gas leak exceeds the standard, the gas detector will emit a slow, accelerated or pressed sound alarm, continuous at 85 dB. It cannot detect toxic gases such as carbon monoxide. LED digital display and sound warning-- The gas detector indicator shows 0 under normal conditions. If a flammable gas leak is detected, the numbers 1-9 and A may be displayed on the screen. The alarm sounds and flashes red once the concentration is above 3% LEL. The alarm will be in different alarm states depending on the concentration of flammable gas. Durability and energy saving-- The standard European plug design, plug-and-play, no converter required, makes it extremely easy and convenient to install. This detector is anti-mold, anti-pest and anti-corrosive. Flame-retardant ABS plastic, easy to clean. Uses less than 2 watts of electricity, significant energy saving. Widely used for restaurant, kitchen, hospital, hotel, oil factory, garage, gas station and so on. Test Method-- Press the switch of the lighter located at the gas inlet of the methane detector and hold it down, then deflate slowly (do not turn it on while deflating). When the concentration reaches the standard, the alarm will sound until the volume of the gas in the environment falls below the alarm point. Precautions: The system warm-up time is approximately 2-3 minutes. During this period the gas test will not work.