Detect 4 kinds of gas: carbon monoxide(CO), hydron sulfide(HS), (O) and combustible gas(LEL). Continuously monitor the CO, HS, O and LEL gas concentration in the surrounding environment with professional and accurate measurement. Intellint voice, Sound & light vibration alarm works when one of the CO HS O LEL gas concentration reaches the level of the alarm Can set tomatic shutdown time and concentration of alarm value Lar color LCD display with backlight for easy reading Can connect to a sampling pump to operate in closed place It adopts advanced integrated circuit technology embedded computer control imported gas sensors, with excellent sensitivity and repeatability. It uses dot matrix LCD display to support Chinese-English interface and Chinese-English voice prompt, so that users can quickly understand the product and use and maintain it simply. engineering plastics, good seismic resistance, high-grade atmospheric appearance and dust-proof, waterproof Detection Gas: Carbon Monoxide(CO), Hydron Sulfide(HS), (O), Combustible Gas(LEL), Manufacturer: SLZJWLPPA