The Core 400S Smart True HEPA Air Purifier efficiently cleans the air of rooms as large as 36 square meters while operating with noise levels as low as 24dB. VortexAir Technology™ speeds up circulation through 3-stage filtration, while PlasmaClean™ technology uses positive and negative ions to neutralize bacteria and viruses. With AirSight Plus™, the Core 400S saves energy and filter life by using a laser particle sensor to scan the surrounding air quality levels and auto-adjust the fan speed. Smartphone control lets users monitor air quality, view filter life, and set schedules.