The wireless CO2-, temperature- and humidity-sensor is build for indoor usage. It sends precise data Sigfox simultaneously. The self-sufficient wireless high-precision NDIR CO2-sensor can easily be mounted on a wall and works efficiently over several years with one battery. The sensor is made for Internet of Things (IoT) applications for smart home, smart offices, smart buildings, smart villages, smart cities and smart countries. It has been designed in Germany and is being manufactured in Germany.