The Blueair Classic air purifier removes airborne pollutants which may cause allergies and asthma attacks. You can operate the air purifier via the Blueair Friend app, anytime, anywhere. This air purifier is suitable for spaces of up to 100m2. The filters removes dust particles, pollen, viruses, and bacteria from the air. When you need to replace the filters, you'll receive a notification via the app. This way, you're always ensured that the air purifier will optimally clean the dirty air in the room. In addition to the app, the Classic 405 also has touch buttons on the control panel. The simple icons show the status of the WiFi connection, operating speed, and filter, allowing you to adjust the desired functions in various ways.