Feature:1. Detect 4 kinds of gas: carbon monoxide(CO), hydrogen sulfide(HS), oxygen(O) and combustible gas(EX). Intelligent voice, sound, light, vibration alarm will work when one of the these gas concentration reaches the level of the alarm.2. It adopts high-quality gas sensors, with super high sensitivity, excellent repeatability, accurate measurement, and quicker response time. The gas detector can provide enhanced conservation to you.3. High-strength engineering plastics, good seismic resistance, high strength, high-grade atmospheric appearance and dust-proof, waterproof and explosion-proof function.4. Large LCD display for easy reading supports Chinese-English interface and Chinese-English voice prompt. It has compact size and unique clip design which make it be convenient for user to carry around.5. It can be widely used in shipping, mining, oil exploitation, chemical, gas pipeline, tunnel construction, coal, metallurgy, paper, fire, municipal, textile and other industries.Specification:Item Name: Gas Detector Material: ABS 4 Gas: CO, H2S, O2 and EX gas Battery: Built in 1800mAh battery Charging time: 4-6 hours Working time: 10 hours Alarm Mode: Sound, light alarm, and vibration alarm Product size: 140x73x32mm/5.51x2.87x1.26inProduct weight: 300g .Package List:1 x Gas Detector1 x Adapter1 x ManualNote:1. Please allow 1-2mm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.