CO2 Meter Ambient Air Traffic Light Air Quality Gas Detector with NDIR Sensor 3-in-1: CO2 detector can monitor the CO2 concentration (400-5000PMM), temperature (0-50C) and humidity (0%-99% RH) around you in real time, updated every 2 seconds, more accurate data, better built-in chip, faster detection! LCD Display and Smart Backlight: Large LCD display and smart backlight help you read more easily, the concentration of CO2, Hcho and Tvoc is clear at a glance, even at a long distance! And the size is small, convenient to carry with you. USB Rechargeable Battery: Built-in 1200mAh high-capacity battery, can work for 14 hours, only support 5V adapter or USB charging computer. Other functions: intelligent early warning system, gas identification algorithm, multiple anti-interference, air convection technology, greenhouse compensation calibration, suitable for agricultural planting, production warehouse, processing goods, home, school, office and other occasions. Note: Due to the unstable atmospheric environment, the sensor of this product is sensitive to the environment, and the data may be slightly different!