[Boosted Bass. Brighter Treble] The innovative coaxial dual driver acoustic architecture consists of an 11mm bass driver and a 6mm micro-planar tweeter, providing studio-quality acoustic listening at both high and low frequencies. [Up to 40 hours of Playback]Battery life and flash charging taken to the next level. Up to 40 hours of playback, giving you power to last a full week. And when you need