Dyson's latest purifiers combine intelligent sensing with an advanced filtration system. Three phases of purification sit within a fully sealed filtration and airflow system. So what goes inside, stays inside. A solid-state formaldehyde sensor and a unique catalytic filter detect and continuously destroy formaldehyde. Then powerful Air Multiplier technology purifies, heats the whole room and cools you.² Third party full machine testing based on Gb/T 18801-2018 formaldehyde cumulative clean mass testing with continuous injection until plateau of formaldehyde Cadr is achieved. Results may vary in practice.²Tested In maximum setting for air projection, tested in Auto mode for purification coverage, tested for room heating per relevant Dyson method DTM961. 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.