Dyson's most advanced filtration system combines a precise, solid-state formaldehyde sensor with a unique catalytic filter that continuously destroys formaldehyde. And Dyson purifiers have powerful Air Multiplier technology to purify the whole room.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 per Dyson internal test standards for whole-room air projection (Tm-005021) and purification coverage (Tm-003711). 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. Refer to the MyDyson app for compatible voice services. TP09 is a fan, not an air conditioning unit.