Air quality monitor, CO2 measuring range: 0–2,000 ppm, Humidity measuring range: 0–100% r. F., Temperature measuring range: 0–50 °C (PT1000 class B), With illuminated colour display, Traffic light display function: green < 800 ppm/yellow 800 – < 1,000/red 1,000–2,000 ppm, NDIR sensor with auto calibration, Measuring principle capacitive, Power supply: 12–34 V AC/DC, Mounting: wall mounted or on a stand, Enclosure dimensions: 87.5 x 87.5 x 30 mm, Protection class IP30, Incl. 12 V plug-in power supply (1.5 m) and stainless steel stand