The CO2 traffic light/air quality sensor "School" is an effective device for monitoring indoor air quality. This gas detector is specifically designed for use in schools and other educational institutions, providing a reliable way to monitor CO2 concentration. With an optical warning signal, the device informs users about air quality, allowing timely measures to improve ventilation to be taken. The sensor is suitable for wall mounting and features a compact design, measuring 303 mm in height and 55 mm in width. The IP20 protection rating ensures that the device is suitable for indoor use. It operates via the power grid, enabling continuous monitoring. The striking yellow color design ensures that the sensor is highly visible in any room. With a diameter of 55 mm, the sensor is unobtrusive and can be easily integrated into various room designs. The CO2 traffic light/air quality sensor "School" is therefore an essential tool for promoting healthy indoor air quality.