Acoustic Noise Cancelling HeadphonesUp to 20 Hours of Wireless ListeningQuick Charge Time of 15 Minutes For 3.5 HoursBose AR EnabledControllable Noise CancellingIntuitive Touch ControlsWireless Connectivity via BluetoothAmazon Alexa Built-InGoogle Assistant Built-InAdaptive Mic System for Superior Voice PickupBose Music App Available for Apple & AndroidStreamlined & Durable Stainless-Steel HeadbandSupplied Accessories:Audio CableUSB Charging CableCarrying CaseQuick Start GuideColour: BlackH203 x W165 x D51 mm