This product is a super super high-definition wall-mounted multi-functional air quality detector, which can detect carbon dioxide concentration (CO2), intuitive and clear digital display, you can see the temperature, humidity, time, carbon dioxide concentration in one interface.And it has a carbon dioxide alarm function.            Feature：        -Common Screen display        -CO2 Technology : infrared ( NDIR)        -Temperature unit between Celcius and Fahrenheit Switch        -24 hours real time monitoring.        -Detection range:CO2 ( 400-5000 ppm)        -Power supply：rechargeable Li-battery 2000mah includding USB Chargeing cable 3M             Specifications:        Product Name：Wall Mount CO2 Meter        Material：ABS        Size：365*230*40mm        CO2 Sensor：infrared ( NDIR)        CO2：400-5000 PPM        Measure Components：CO2 detector        Power Supply：2000mAh lithium battery rechargeable        What are included ：Main Unit+ manual+charging cable            Package Included:        1 x Air Quality Detector        1 x Manual         1 x USB Cable