Advanced noise cancelling. 40mm 16 ohm neodymium speaker driver. Unique EQ setting. Conversation mode - visor flips down and pauses audio and airflow. Contact-free visor delivers purified air to nose and mouth. Two-stage sealed filtration system removes 99% of ultrafine particles. Monitor surrounding air quality. MyDyson app - Enhance listening and air purification. Up to 4 hours of playtime with purification and ANC. Auto on/off sensors. Includes: Charging cable. Visor sleeves. Visor cleaning brush. 2 Electrostatic carbon filters. Hard case.