Features:  Compact size with a portable storage, easy to operate and to carry around.  With professional NDIR detection technology, real time CO2 monitoring by the high-precise sensors, and it will alarm you once the CO2 is exceed the setting value.  4.0inch LCD(TFT 480*320)full color display date, time, CO2, humidity, temperature, and other data clearly.  Equipped with Max/min value display function, you can on or off this function according to your demands.  With Wifi setting function, Wifi reset function you can choose smartconfig and APconfig; and you can on or off Wifi power.  Record interval settable design, you can set the interval of recording data of 5s, 30s, 1min, 5min, 30min and off.  Can store up to 2,000 groups of data, and has a chart of historical data trend for you to review.  Support generate a PDF file, connect to a computer, display a disk to view and copy the previously generated PDF file for conveniently checking and analyzing, also support formatted the disk.  Support set the backlight operation time, 1min, 10min, 30min, 1hour and you also can off the backlight.  Support set the brightness of backlight, 25%, 50%, 75%, 100%, you can set according to your use habit.  Support set the RGB light display, you can choose on or off the RGB LED light.  Support data clear, support on/off display max/min mode, support set time and data, support restore to factory setting and with calibration function.  Support set the automatic shutdown time, 15min, 30min, 45min, 1hour, 2hour, 4hour, 8hour and close the function.  Support smartphone APP controls, you can see the CO2 value, temperature and humidity value through your mobilephone, and has a corresponding curve chart of historical recorded data trend for you to review.  The application field of carbon dioxide detector is public site, agriculture, animal husbandry, industry, and more.    Specifications:  Name: Carbon Dioxide Detector  Material: ABS  Display: LCD (4.0inch TFT 480*320)  Battery: 1 * 3.7V, 2600mAh battery (included)  Input: (USB) 5V, 2A  Measuring Range: 0-9999PPM  Resolution: 1PPM  Accuracy: ±10%readings±40PPM  Temperature Measurement Ranges: -20~60& 8451;(-4~140& 8457;)  Temperature Measurement Accuracy: ±1& 8451;(±2& 8457;)  Temperature Resolution: ±1& 8451;/& 8457;  Humidity Measurement Range: 0~99%RH  Humidity Measurement Accuracy: ±3%RH  Working Temperature Ranges: -10~60& 8451;(-14~140& 8457;)  Working Humidity Ranges: 0~99%RH  Storage Temperature Ranges: -40~80& 8451;(-40~176& 8457;)  Recharging Time: 3 hours  Record Groups: 2,000 groups  Auto Power Off: apable of being set  Screen Size: 83 * 55mm / 3.27 * 2.17in  CO2 Detector Size: 140 * 117 * 44mm / 5.51 * 4.61 * 1.73in  Item Weight: 291g / 0.64lb  Package Size: 235 * 158 * 63mm / 9.25 * 6.22 * 2.48in  Package Weight: 440g / 0.