The Beurer LR 401 air purifier uses a pre-filter, HEPA H13 filter and activated-carbon filter. It supports control through the beurer FreshHome app, automatic adjustment to measured air quality and a night mode with the control panel switched off. A filter-change indicator and timer are included.filter system: Pre-filter, HEPA H13 and activated carbonair delivery rate: Approximately 266 cubic metres/hourmaximum room area: Up to approximately 69 square metresfan settings: Four plus turbo modepower: 50 W