4 in 1 Gas Detector CO Monitor Digital Handheld Toxic Gas Carbon Monoxide Detector Hydrogen Sulfide Gas Tester with LCD Display Sound+ Light Vibration Alarm This professional 4 in 1 gas detector is designed for detecting CO, H₂S, O₂ and LEL gas. It can continuously monitor the CO, H₂S, O₂ and LEL gas concentration in the surrounding environment, once the gas concentration reaches the level of the alarm, the alarm will sound, light and vibrate. High precision portable CO, H₂S, O₂ and LEL gas tester with compact size and light weight, very easy to carry and operate. Specifications: Material: ABS Color: Black, Orange Plug: EU, US Detection Gas: Carbon Monoxide(CO), Hydrogen Sulfide(H₂S), Oxygen(O₂), Combustible Gas(LEL) Precision: ≤±5%FS Response time: T<30s Display: LCD display real-time data and station of system Alarm: Audible-visual-vibration alarm with voice alarm Work temperature: -20℃ -50℃, <95%RH non-condensing Power supply: DC 3.7V/1800mAh（Rechargeable lithium battery） Explosion-Proof grade: ExibIIBT3Gb Battery charge time: 4h-6h Working time: Over 10 hours Sensor life: 2 years Protection grade: IP65 Measurement Range: (0-100)%LEL, (0-100)ppm, (0-30%)%VOL Low Alarm Point: 10ppm, 50ppm, 19.5%VOL, 20%LEL Alarm Point: 35ppm, 150ppm, 50%VOL, 23.5%LEL Resolution: 1ppm, 1ppm, 0.1%VOL, 1%LEL Accuracy: ≤±5%FS Dimension: 140mm x73mm x32mm Weight: 217g Package size: 23*20.5*10.5cm/9.05*8.07*4.13in Package weight: 721g