Roger Little air purifier continuously measures the quality of air in the room and immediately detects contamination, the air quality indicator lets you know if air quality deteriorates by changing its colour (blue = good, orange = medium, red = poor). Incorporating a pre-filter to remove coarse dust particles and dirt from the air to protect the Dual Filter from heavy contamination and thus optimise its functionality. Developed in cooperation with the German filter specialist Freudenberg Manufacturer's Guarantees the best cleaning results. The Dual Filter is a combination of a HEPA filter and an Activated Carbon filter.The HEPA filter is very efficient at purifying the air of pollutants out of the air, such as fine dust, pollen, viruses and bacteria. The activated carbon filter eliminates bad smells by absorbing gases present in the air (bad odours, tobacco smoke, formaldehyde, toluene, volatile organic compounds, etc.) and filters them out of the airThe Dual Filter must be replaced e