[Protect Yourself] - The gas detector is mainly used to detect natural gas (main component: methane), liquefied petroleum gas (main component: propane, butane) and city gas (alkane, olefin, nonane). The gas detector emits a slow, accelerated or precipitated continuous audible alarm at 85 decibels when a combustible gas leak exceeds the standard. It cannot detect toxic gases, such as carbon monoxide. [Digital LED Display and Audible Warning] - Under normal conditions, the gas detector's indicator reads 0. If a combustible gas leak is detected, the numbers 1 to 9 and A may appear on the display. Once the concentration exceeds 3% LEL, the alarm will sound and flash red. Depending on the concentration of combustible gases, the alarm will be in different alarm states. [Durable and Energy Saving] - Standard European plug design, plug and play, no converter required, making it extremely easy and convenient to install. This detector is anti-mould, anti-parasite and anti-corrosion. Flame retardant ABS plastic, easy to clean. Uses less than 2 watts of electricity, a great energy saver. Widely used in restaurants, kitchens, hospitals, hotels, oil plants, garages, petrol stations, etc. [Test Method] - Press the cigarette lighter switch at the gas inlet of the methane detector for a long time, and then slowly deflate the gas (do not turn on the unit while deflating). When the concentration reaches the standard, the alarm will sound until the volume of gas in the environment drops below the alarm point. Precautions : The system requires approximately 2 to 3 minutes to warm up. During this time the gas test will not operate. After Sales Guarantee] - This gas alarm is safe and durable. It uses high quality sensors, semiconductor heating and SMT chip technology. Size: 120-*69mm