The DS-CO2-20 Sensor Modules 31x20x11 RoHS manufactured by Plantower is a digital module designed to measure air quality in areas that may contain high concentrations of carbon dioxide (CO2) pollutants. The module is made up of a series of components, including a microcontroller, an optical sensor, a carbon dioxide concentration detection circuit, and a temperature/humidity measurement component. The module is RoHS compliant, meaning that it is constructed without materials that are deemed to be hazardous to human health. It is intended to be used in environments where precise monitoring of environmental air quality is required.