Healthy air and healthy people: Accurately monitor indoor air quality - CO2, temperature and humidity in real time. Use non-dispersive infrared (NDIR) sensor technology for the most accurate CO2 measurements. Safety for All - Monitor public and private areas for elevated CO2 levels due to large groups of people exhaling CO2 in enclosed spaces. CO2 is an accurate surrogate for measuring the risk of indoor transmission of airborne pathogens. Increase outdoor air ventilation to reduce carbon dioxide levels in indoor spaces and the risk of virus transmission. Suitable for everyone: simple and beautiful large screen, easy operation and same wall function, perfect for school, office, home. Packing list: 1 x CO2 detector (package without battery). We only sell CO2 detectors, not other items in the picture. Due to the difference between different monitors , the pictures may not reflect the actual color of the item. Due to manual measurement, please allow slight errors in size.