The CO2-Alarm GX-D11 is a CO2-Warning device for mobile use, which is simply plugged into a free socket. The first result is displayed after 3 minutes of operation and the initialization phase has expired. At 1000 ppm for yellow and 2000 ppm for red, the concentration thresholds are based on the recommendations of the RKI for school operations.The GX-D11 CO2 warning device hits the nerve of the time. Increased exposure of the ambient air to carbon dioxide from the exhaled air is directly related to the exposure of the interior to aerosols, the carrier particles for viruses and bacteria. The GX-D11 reminds you visually and acoustically of regular ventilation, in order to keep the germ load in the room low and the air fresh. Especially in winter, there is no need to fear that the room will cool too much, because extensive internal and external tests have shown that the so-called rules of thumb without CO2 monitoring are too strict for safety reasons.LEDs green, yellow and red corresponding air qualities:green / fresh – hygienic safeyellow/bathroom – hygienicred / worst – hygienic unacceptableIn the CO2 warning device GX-D11 a real NDIR (infrared) sensor is installed, which cannot be deceived by air cleaning devices, since they cannot filter CO2 from the air.CO2 not only correlates with the general microbial load in the interior, but also displaces oxygen in higher concentrations, thus presenting a strain on the human immune system. And even before man gets tired by a drop in concentration and efficiency and feels himself that it would be time to provide fresh air again.This text is machine translated.