Our Sense device monitors the CO2 content in the indoor air of the room. The device visually indicates when the air quality is poor and when action needs to be taken. Blue means good indoor air quality, orange means it is not good enough and red means unhealthy indoor air. But the Renson Sense is much more than a classic CO2 meter. The device also monitors moisture, volatile organic compounds (VOCs) such as odours, noise, temperature and light.