Usage Tips:Keep Safe-- The gas detector is mainly used to detect natural gas (main components: methane), LPG (main components: propane, butane) and urban coal gas (alkane, olefin, arenas). When the combustible gas leak exceeds the standard, the gas detector will sound a slow, accelerated or hurried, continuous 85dB sound alarm. It cannot detect poisonous gases such as carbon monoxide. Digital LED Display and Audible Warning-- The gas detector indicator shows 0 under normal conditions. If a flammable gas leak is detected, 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 European standard 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-corrosion. 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 lighter switch located at the gas inlet of the methane detector and hold it down, then deflate slowly (do not turn it on during deflation). 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: System warm-up time is approximately 2-3 minutes. During this period, the gas test will not work. After-sales Guarantee-- This gas alarm is safe and durable. It uses sensors, semiconductor heating and SMT chip technology.