Automatically senses, captures, and traps pollutants for cleaner air. Number of speeds : 10. Special Features: ‎Purifying heater, Purifying fan, HEPA filtrationMultifunctional. Intelligently purifies, heats, and cools youFully sealed to HEPA H13 standard. It's not just the filter that's fully sealed, it's the whole machine. So what goes inside stays insideAir Multiplier technology generates the circulation power to draw distant pollutants into the machine, projecting purified air throughout the whole roomAutomatically senses and reacts to changes in air quality, then reports pollution in real time on LCD screen and on the MyDyson appChoose between Fan mode for direct cooling with up to to 350 degree oscillation and Backward airflow mode to purify without cooling youThe filter is quick and easy to change. With automatic filter-life notifications on the LCD screen or MyDyson appProgram your machine to turn off after pre-set intervals between 30 minutes and 8 hoursIn Night mode, the machine monitors and purifies using the quietest settings with a dimmed displayControl your machine hands-free with compatible voice services. Works with Amazon Alexa, Apple Siri, and Google Home