CO2 Mon , CO2 Detector Dioxide Mon NDIR Sensor 400-5000 PPM Mon CO2 Meter Temperature Humidity Mon Indoor CO2 Alarm, 1600mah h Mon ing -LED screen display - Infrared carbon dioxide sensor - Temperature display: Celsius - detection range: 400-5000 ppm -The alarm value of carbon dioxide exceeding the standard: 1000ppm, you can double-click the power button to turn off the function of exceeding the standard alarm. - supply mode: built-in 1600 mAh Know the Around You: The air quality tester has built-in advanced infrared (NDIR) and laser light scattering detection sensors designed to accurately track air quality, including carbon dioxide, temperature and humidity. TIP: Please allow the device to work outdoors for a few minutes before use for the most accurate results. CO2 visualization: display: 400~999ppm green (safe) 1000-2000ppm yellow (warning) 2001-5000ppm red (excessive). The indicator light changes color according to the different levels of carbon dioxide concentration, allowing you to easily grasp the current state of carbon dioxide concentration in the air. dby and Alarm Function: Built-in 1600 mAh , which can provide 6-8 hours of standby time when fully charged. In addition, it can also be powered in real time through the included USB charging cable to meet the needs of long-term air quality testing. Alarm when CO2 reading exceeds 1000ppm [Honeycomb heat dissipation]: The honeycomb heat dissipation design on the back not only ensures that the sensor is in full contact with the air, but also facilitates heat dissipation, reducing false al caused by excessive temperature and insufficient contact with the outside air. Ultra- Appearance: Small size, easy to carry, and easy to change the measurement position. Widely used in closed environments, it can be installed in crowded areas such as restaurants, nurseries, schools, welfare facilities, cars, etc.