This sensor measures the CO2 level in a living or working space, such as a nursing home room, school classroom, doctor's office, etc. When the maximum level is reached (alarm and different coloured pictogram), it is time to ventilate. Displays temperature and humidity. Backlighting. Dimensions : 8 x 8 x 2.5 cm. Weight : 110 g. Adapter supplied, rechargeable. Two-year warranty.