The perfect companion for indoor use, allows you to monitor CO2 content, temperature, relative humidity and air pressure in real time. Easy for everyone to use – the colour coding and the optional buzzer warns you when the CO2 concentration becomes too high. The energy-efficient E-Ink display ensures a particularly long battery life of the radio Smartphone app for viewing and analyzing historical data up to 90 days history Uses non-dispersive infrared sensor technology (NDIR) for the most accurate and reliable CO2 readings