Stay Safe - Gas detectors are mainly used to detect natural gas (main components: methane), liquefied petroleum gas (main components: propane, butane) and city gas (alkanes, olefins, aromatics). When the flammable gas leakage exceeds the standard, the gas detector will send out a slow, accelerated or rapid, continuous 85 decibel sound alarm. It cannot detect toxic gases such as carbon monoxide. Digital LED display and audible warning -- The gas detector indicator shows 0 under normal conditions. The numbers 1-9 and A may appear on the screen if a flammable gas leak is detected. Once the concentration exceeds 3% LEL, the alarm will sound and flash red. The alarm will be in different alarm states according to the concentration of combustible gas. Durable and energy-saving--European standard plug design, plug and play, no converter required, extremely simple and convenient installation. The detector is anti-mildew, anti-insect and anti-corrosion. Flame retardant ABS plastic, easy to clean. Significantly energy efficient using less than 2 watts of electricity. Widely used in restaurants, kitchens, hospitals, hotels, oil factories, garages, gas stations, etc. Test method - press and hold the lighter switch located at the air inlet of the methane detector, and then slowly deflate (do not open when deflated). When the concentration reaches the standard, the alarm will sound until the volume of gas in the environment is lower than the alarm point. Note: The system warm-up time is about 2-3 minutes. During this time, the gas test will not work. After-sale Guarantee -- This gas alarm is safe and durable. It adopts high-quality sensor, semiconductor heating and SMT patch technology.