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WHAT IS THE IMPORTANCE OF CO2 MONITOR? CO2 is not an air pollutant, but it can still harm us when levels are too high. When levels rise, we tend to get sleepy and have trouble focusing, and some people even develop headaches. For this reason, occupants need to have a CO2 monitor to stay at a healthy level. Accurate Detection A High-Precision NDIR sensor is adopted in the CO2 detector. It works quickly, stably, and won't be affected by temperature or other conditions than the outdated sensor. The accuracy can reach to ±50ppm or ±5% of reading. The sensor of the CO2 monitor has a long service life, up to 15 years. Intermittent Detection Mode ln order to extend the service life of the product, it will enter the intermittent detection mode after 30 minutes of operation. In this mode, the sensor will work intermittently and the detection interval will be changed to 5~30 minutes adjustable. Press any key to exit this mode. Specification Package Dimensions : 3.98 x 3.5 x 1.65 inches; 4.23 Ounces Temperature Range: -10 ~ 40 ° C (± 1 ° C) Humidity Range: 20% ~ 80% (± 5% RH) Batteries : 18650 lithium battery / 2400 m Ah CO2 Range: 0 ~ 5000ppm CO2 Resolution: 1 ppm Indicator Light: Green (0 ~ 700ppm) / Yellow (700 ~ 1500ppm) / Red (Over 1500ppm)