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 supplyrechargeable Li-battery 2000mah includding USB Chargeing cable 3M Specifications: Product NameWall Mount CO2 Meter MaterialABS Size365*230*40mm CO2 Sensorinfrared ( NDIR) CO2400-5000 PPM Measure ComponentsCO2 detector Power Supply2000mAh 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