Specifications of Multi Gas Detector PLT840. Gas types: EX, H2S, CO, O2. Range: (0-100)%LEL, (0-100)ppm, (0-1000)ppm, 0-30%vol. Low alarm point: 20% LEL, 10 ppm, 50ppm, 19.5%vol. Alarm point: 50% LEL, 35ppm, 150ppm, 23.5%vol. Resolution: 1% LEL, 1 ppm, 0.1% vol. Display error: less than or equal to ±%FS. Display time: T less than 30s. Indication mode: LCD liquid crystal display for real-time data and system status, light, vibration, and human language (English) prompts. Working environment: temperature -20°C to 50°C. Humidity: Less than 90% RH condensation. Working voltage: DC 3.7V. Battery capacity: 1800mAh. Charging time: 4h-6h. Standby time: More than 20 hours under full power. Plug Type: EU Plug (applies to Indonesia, Germany, France, Spain, Italy, etc.). Sensor life: 2 years. Size: 140x32x1mm. Material: ABS.