4.0in TFT full color displayed carbon dioxide detector real-time display current time, date, CO2, temperature and relative humidity. 2000 groups test data record can be exported to PDF file for convenient analysis. It also has a new function of displaying MAX and MIN value.  2200mAh lithium battery with USB charging port,  long lasting and convenient charging. Features: PDF Data Export Function -- 2000 goups value records, display the MAX, MIN and AVG values of carbon dioxide, temperature and humidity.  Export PDF function allows you to connect with computer and export the PDF file for conveniently checking and analyzing. 4 Inch TFT Full Color Display -- Large screen real-time display current time, date, CO2(MAX, MIN and E-moji Grade), temperature, relative humidity, data record interval and recordings and battery power.  Display backlight brightness, standby time and RGB indicator light are adjustable. Alarm Setting -- Real time CO2 monitoring by the high precision sensor, and it will alarm you once the CO2 is exceed the setting value. The buzzer alarm can turn off according to your demands. 2200mAh USB Rechargeable -- 2200mAh large battery capacity, 3 hours full charging and support over 10 hours working demands. USB charging port can be powered via almost any standard USB port, e.g. power bank, laptop or adapter. Portable & Practical -- Compact size with a portable storage, easy to operate and to carry around. The application field of carbon dioxide detector is public site, agriculture, animal husbandry, industry, and more. Specification: Material: ABS Display: LCD (4.0TFT 480*320) Record Groups: 2000 groups Measuring Range: 0~9999PPM Resolution: 1PPM Accuracy: ±40PPM±rdg10% Temperature Measurement Range: -20~60℃(-4~140℉) Temperature Measurement Accuracy: ±1℃ Temperature Resolution: 0.1℃ Humidity Measurement Range: 0~100%RH Humidity Measurement Accuracy: ±3%RH Humidity Resolution: 0.1%RH Working Temperature Range: -10~60℃(-14~140℉) Working Humidity Range: 0~99%RH Storage Temperature Range: -40~80℃(-40~176℉) Battery Capacity: 2200mAh Input: (USB) 5V, 1A Charging Time: 3 hours Using Time: >10 hours Product Size: 140*117*44mm/5.5*4.6*1.7in Product Weight: 236g/8.3 Packing List: 1 * Carbon Dioxide Detector 1 * User Manual 1 * USB Cable