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 leakof combustible gas exceeds the standard, the gas detector will emit a slow, accelerated or hurried continuous 85dB alarm. It cannot detect toxic gases such as carbon monoxide. LED Digital Display & Audible Warning-- The gas detector display will show 0 under normal conditions. When a flammable gas leak is detected, the numbers 1-9 and A can be displayed on the screen. Alarm clock rings and flashesin red as soon as the concentration is above 3% of the LEL. The alarm is in different alarm states depending on the concentration of combustible gas. Durability and Energy Saving-- European standard plug design, plug and play, no converter required, makes installation extremely easy and convenient. This detector is anti-mold, anti-pest and anti-corrosion. plasticFlame retardant ABS, easy to clean. Consumes less than 2 watts of electricity, significant energy savings. Widely used for restaurant, kitchen, hospital, hotel, oil factory, garage, gas station and so on. Test Method-- Press and hold the lighter switch on the gas inlet of the methane detector, and then slowly deflate (do not turn it on during the deflating). When the concentration reaches the standard, the alarmwill sound until the volume of gas in the area falls below the alarm point. Precautions: The system warm-up time is about 2-3 minutes. During this time, the gas test will not work.