The Dyson HEPA Cool Formaldehyde™ is engineered with Dyson's most advanced filtration system that combines a precise, solid-state formaldehyde sensor with a unique catalytic filter that continuously destroys formaldehyde. Powerful Air Multiplier™ technology purifies air throughout the whole room. In maximum setting. Tested for air projection (DTM801) and purification coverage in a 2860ft3 room (TM-003711) Third party full machine testing based on GB/T 18801-2018 formaldehyde cumulative clean mass testing with continuous injection until plateau of formaldeyde CADR is achieved. Results may vary in practice. Requires device to run app, Wi-Fi or mobile data, Bluetooth 4.0 support, and iOS version 10 or Android version 5 (or above). Standard data and messaging rates may apply. Automatically senses, captures, and traps pollutants for cleaner air..number_of_speeds : 10 Detects and destroys formaldehyde released from household items. Fully sealed to HEPA H13 standard. The HEPA filter captures 99.97 percent of particles 0.3 microns in size. An additional filter removes odors and gases including VOCs. Air Multiplier technology generates the circulation power to draw distant pollutants into the machine, projecting purified air throughout the whole room. Automatically senses and reacts to changes in air quality, then reports pollution in real time on LCD screen and on the MyDyson app. Choose between Fan mode for direct cooling with your choice of 0 to 350 degree oscillation and Backwards airflow mode to purify without cooling. The filter is quick and easy to change. With automatic filter-life notifications on the LCD screen or MyDyson app. Program your machine to turn off after pre-set intervals between 30 minutes and 8 hours. In Night mode, the machine monitors and purifies using the quietest settings with a dimmed display. Control and monitor your air quality from anywhere using the MyDyson app.