Carbon Dioxide Detector 3 in 1 Indoor Air Quality Monitor Portable CO2 Monitor Tester for CO2 Temperature and Humidity Item Type: Carbon Dioxide Detector Material: ABS Display: Color LCD Display Time And Date: Manual Adjustment Language: Chinese, English ( Switchable ) Historical Data: 30 Days View Brightness: Adjustable Carbon Dioxide Detection Technology: NDIR Auto Calibration: Automatic Calibration, Also Support Manual Calibration Temperature Unit: Celsius, Fahrenheit ( Switchable ) CO2 Detection Range: 400-5000 ppm (Accuracy 1ppm) CO2 Alarm Value: 800 ppm, Alarm value can be set manually between 800 ppm and 2400 ppm. CO2 Alarm Sound: On And Off Function Atmospheric Pressure: 86Kpa-106Kpa Sampling Time: 1.5s Detection Temperature: -10°C-50°C ( Accuracy ±1°C ) Detection Humidity: 20%-85%RH ( Accuracy ±4%RH) Battery: 1 x 2000mAh Lithium Battery ( Shipped With Built In Battery )