This item is REFURBISHED 4-Mic Digital Hybrid Active Noise CancellationAmbient ModeBluetooth Wireless TechnologyUp to 22 Hours of BatteryRapid Charge: 10 Minutes 4 HoursNoise Isolating FitRefined AcousticsCall, Track and Volume ControlFlat-folding and CollapsibleTrack and Find if Lost via Tile® Read more