Protect Yourself-- 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 emit a slow, accelerated or rushing 85dB continuous sound alarm. It cannot detect toxic gases such as carbon monoxide. LED digital display and sound warning-- The gas detector indicator shows 0 in normal conditions. If a flammable gas leak is detected, the numbers 1 to 9 and A may appear on the display. 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 socket design, plug -and-play, no converter required, makes it extremely easy and convenient to install. This detector is anti-mold, anti-parasite and anti-corrosion. Flame-retardant ABS plastic, easy to clean. Uses less than 2 watts of electricity, significant energy saving. Widely used for restaurants, kitchens, hospitals, hotels, oil factories, garages, gas stations, etc. Test method- - Long press the cigarette lighter switch located at the gas inlet of the methane detector, then slowly deflate it (do not turn it on while deflating). When the concentration reaches the standard, the alarm will sound until the gas volume in the environment falls below the alarm point. Precautions: The system warm-up time is approximately 2 to 3 minutes. During this period, the gas test will not work. After-sales guarantee-- This gas alarm is safe and durable. It uses high-quality sensors, semiconductor heating and SMT chip technology.