Bose® noise cancelling technology, shut out the world and focus on your music, Aware mode to hear what’s around you at the press of a button, Deep, clear sound from the Active EQ and TriPort® technology, Soft and secure for hours of listening from proprietary StayHear®+ ear tips, The lithium-ion battery (located inside the module) charges in just 2 hours with the included USB cable, and delivers up to 16 hours playing time per charge..