Feature:1. Intelligent Carbon Dioxide Tester: The gas analysis uses the air semiconductor TVOC sensor, and the air quality monitors the temperature and humidity.2. High Performance: High quality air quality detector, using high quality electrochemical detection module, good accuracy, stable performance, strong anti interference ability, low consumption and long service life.3. Accurately Detect Carbon Dioxide: Large screen displays electricity, CO2, temperature and humidity.4. No Calibration Required: Test at power on to accurately detect carbon dioxide.5. With Large Screen: Different font colors show different air quality, 400800ppm: green flash, 8001800ppm: orange flash, greater than 1800ppm: red flash, Feng Ming alarm about 30 times in 5 seconds.Specification:Item Type: Air Quality MonitorMaterial: ABSModel: ZN-AZ-2COHDO5Battery: Rechargeable Lithium Battery 3.7V 1200mAh (Built in Battery)Application: Ambient Gas Quality DetectionCO2 Detection Range: 400~5000ppm, Accuracy: 1ppmHCHO Detection Range: 0.005~2mg/M3TVOC Detection Range: 0.008~2mg/M3Temperature Detection Range: 0~70, Accuracy: 1Humidity Detection Range: 0%~99%RH, Accuracy: 2%.Package List:1 x Detector1 x USB Data Cable1 x User Manual