4 Gas Detector This 4-in-1 gas detector is the right choice to protect your and your family's health and property. Our multi-gas detector used advanced integrated circuit technology, embedded microcomputer control, high-tech imported gas sensor, excellent sensitivity, and repeatability. Applicable Occasions and Crowds: Robust for industrial use for utility workers, refinery workers, firefighters, maintenance engineers, those who spend time in sewers and waterworks, underground storage tanks, oil rigs, tanks, and silos in the maritime industry, and many others who need personal protective equipment. This item supports testing for CO, O2, H2S, and EX. The range on this device for these gas are: EX: (0-100)%LEL, low alarm: 20% LEL, high alarm: 50%LEL, resolution:1%LEL. H2S: (0-100)ppm, low alarm:10ppm, high alarm: 35ppm, resolution: 1ppm.CO: (0-1000)ppm, low alarm: 50ppm, high alarm:150ppm, resolution: 1ppm.O2: (0-30)%vol, low alarm: 19.5%vol, high alarm: 23.5%vol, resolution: 1%vol. Features Waterproof Dustproof Explosion proof High temperature resistance Specification Display Error ≤ ± 5% FS Response Time <30 s Working Environment -20 ℃ ～ 50 ℃, <95% RH (no dew) Power Source DC 3.7 V Li-on battery, 1800 mAh Protection level IP65 Gas Sensor Life 2 years Weight 230g(with battery) Dimensions 140 mm × 73 mm × 32 mm (L × W × H) 1800 mAh lithium battery Charging time: 4h-6h Standby time Continuous use for more than 10 hours at a full charge Indication mode LCD real-time data and system status, lighting, vibration, and live voice recording (Chinese and English) Packing List 1 * Detector 1 * User manual 1 * USB cable 1 * plug