High accuracy and high stable carbon dioxide monitor for real time detecting CO2 concentration, temperature, humidity, also display current time and date, really multifunctional and practical to get one.Features:3-inch HD Large LCD Screen Display: simultaneously display CO2 concentration, temperature and humidity, date and time.Audio and Visual Alarm: the CO2 data will upgrade every 3 seconds, once it exceed 1000ppm, it will make sounds and the backlight will turn red.Air Quality is Indicated with Emoticons: according to the CO2 concentration, there are 6 kind of emotion icons to indicate the current air quality.NDIR Infrared Sensor Adopted: professional non-dispersive infrared(NDIR) provide fast and high accuracy measurement results.Rechargeable Battery Power Supply: 1500mAh great capability 3.7V polymer lithium battery, and built-in with power protection chip to ensure security.Automatic and Manual Calibration Function: perfect for various working environments and conditions.Wide Applications: can be used in homes, shopping malls, offices, vehicles, stations, laboratory, cleanroom, greenhouse, CO2 storage room, and more.Specifications:Material: ABSCO2 Range: 400~5000ppmCO2 Resolution: 1ppmCO2 Accuracy: (5%rdg+50ppm) (at normal temp.&humidity, 400~2000ppm)Temperature Range: -10~50Temperature Resolution: 1Temperature Accuracy: 1Humidity Range: 0%~99%RHHumidity Resolution: 1%RHHumidity Accuracy: 5%RH at 25 (10%~99%RH)Working Environment: 0~50, 0%~85%RHStorage Environment: -20~60, 0%~95%RHSensor: NDIR CO2 sensorRespond Time: Packing List:1 * CO2 Monitor1 * USB Cable