Powerful airflow circulation effectively covers rooms up to 79 m² and distributes clean air in every corner of the room Scans the air 1000 x a second to detect ultra fine-particles. Reports the air quality in real time, and intelligently chooses the right speed for your home Both air quality index and the light on the UI can be dimmed and/or turned off to avoid light disturbance Certified by the European Centre for Allergy Research Foundation Philips purifiers go through 170 mandatory and strict inspection tests before releasing from factory. They are subjected to rigorous life and durability tests, for continuous operation 24/7 Thanks to its energy efficient design, the air purifier runs at max. 56 W power. This is equivalent to one standard light bulb In sleep mode, display lights are dimmed, and the purifier operates in near silence for clean air while you sleep